Aetna Leadership

Meet the Aetna executives who are helping to transform health care locally, nationally and around the globe


Executive biographies

Mark T. Bertolini

Mark T. Bertolini

Chairman and Chief Executive Officer of Aetna

Mark T. Bertolini is Chairman and Chief Executive Officer of Aetna, a Fortune 100 diversified health care benefits company with approximately $58 billion in 2014 total revenue.  Aetna serves an estimated 46 million people with information and resources to help them make better informed decisions about their health care and has operations in North America, Asia, Europe and the Middle East.  Mr. Bertolini assumed the role of CEO on November 29, 2010 and of Chairman on April 8, 2011.

Mr. Bertolini joined Aetna in 2003 as head of Aetna’s Specialty Products.  From July 2007 to December 2014, he served as president, responsible for all of Aetna’s businesses and operations across the company’s broad range of health care products and related services – including medical, pharmacy, dental, behavioral health, group life and disability plans, as well as medical management capabilities and health care management services for Medicaid plans.  Prior to serving as Aetna’s President, Mr. Bertolini was executive vice president and head of Aetna’s regional businesses, which included the company’s individual, retiree, small group and middle market segments, as well as numerous product, network and service areas.

Recognized as an accessible, forward-thinking and solutions-oriented leader, Mr. Bertolini is actively engaged in the national dialogue on the future of health care.  Mr. Bertolini meets regularly with state and federal policymakers to promote measures that increase access, lower costs and improve the quality of health care.  He is a strong advocate for a consumer-centered health care system, value-based payment design, and the expansion and use of health information technology.

Firmly committed to diversity and inclusion, Mr. Bertolini also serves as the company’s executive sponsor for diversity, participates in several Aetna employee resource groups, and maintains a blog to communicate with employees.

Mr. Bertolini serves as a director of Verizon Communications Inc. (communications and technology solutions); Mutual Life Insurance Company (insurance and investment products); The Hole in the Wall Gang Camp, a non-profit organization founded by Paul Newman that serves children with cancer and other serious illnesses; and the Fidelco Guide Dog Foundation, a non-profit organization that breeds, trains and places German Shepherd guide dogs with people who have visual disabilities.

In 2009, he was elected the first straight ally board member of the National Gay and Lesbian Chamber of Commerce.  Mr. Bertolini has been honored for his leadership by numerous universities and organizations, including the National Italian American Foundation, Outward Bound, the National Kidney Registry, Out & Equal Workplace Advocates, the Quinnipiac University Business School, and Wayne State University School of Business.

Prior to joining Aetna, Mr. Bertolini held executive positions at Cigna, NYLCare Health Plans, and SelectCare, Inc., where he served as president and chief executive officer.

Born and raised in Detroit, Mr. Bertolini held various jobs throughout high school and college, including assembly work at a Ford Motor Company plant and various caregiver roles in health care delivery.  Mr. Bertolini is a spinal cord injury survivor and is partially disabled as the result of a severe skiing accident in 2004.  In 2007, Mr. Bertolini donated a kidney to his son.  His previous work and personal experiences with the health care system are foundational to his dedication to improving the patient experience and addressing the longstanding challenges facing the U.S. health care system.

Mr. Bertolini holds an undergraduate degree in business administration/finance from Wayne State University and an MBA in finance from Cornell University.

Karen S. Rohan

Karen S. Lynch


As President of Aetna, Karen S. Lynch (formerly Rohan) is responsible for the company’s core institutional businesses: Individual, including public health exchanges; Small Group; Middle Market; Public & Labor; National; Medicare; Medicaid; and Specialty Products, including Pharmacy, Behavioral Health, Dental, Vision, Group Insurance and Disability. 

Ms. Lynch joined Aetna in 2012 as executive vice president and head of Specialty Products.  In 2013, she assumed management of Local and Regional Businesses, Aetna’s largest business unit, dedicated to serving the varied health care needs of individuals and employers. Ms. Lynch successfully led Aetna’s integration efforts for its 2013 acquisition of Coventry Health Care—the largest acquisition in Aetna’s history.

Ms. Lynch has three decades of experience in the health care industry.  Prior to joining Aetna, she served as president of Magellan Health Services where she was responsible for the development and operational execution of the company’s business strategy, as well as the profit and loss for all of Magellan's business units. Prior to Magellan, she was president of the Group Disability, Dental and Vision Care businesses at CIGNA.  This role was the culmination of a career with CIGNA that included a number of positions with increasing responsibilities in business strategy, operations and finance.  Ms. Lynch began her career with Ernst & Young as a Certified Public Accountant (CPA).

Ms. Lynch was named a finalist for the 2013 Female Executive of the Year in the American Business Awards “the Stevies” Competition. One year earlier, she was named the “Most Influential in Specialty Health” by the National Association for Specialty Health Organizations, as well as named to the Business Insurance “Women to Watch” list.  In 2011, Ms. Lynch co-chaired the Health Care and Pharmaceutical Task Force for the Wall Street Journal Women in the Economy Conference. 

Ms. Lynch serves on the board of trustees for The Bushnell Performing Arts Center in Hartford, Conn.; the advisory board of NEADS/Dogs for Deaf and Disabled Americans, a nonprofit organization that provides independence to people through canine assistance; and the advisory board for the Boston office of Ernst & Young.  Ms. Lynch also is a member of the Boston College Women’s Council and served for three consecutive years as Honorary Chair of the Komen CT Race for the Cure.

Ms. Lynch earned her bachelor's degree in accounting from Boston College and an MBA from Boston University.  In 2015, she was presented with an honorary doctorate degree of humane letters from Becker College in Worcester, Mass.

William J. Cassaza

William J. Casazza

Executive Vice President and General Counsel
Law & Regulatory Affairs

William J. Casazza is Executive Vice President and General Counsel, Law & Regulatory Affairs, reporting to the Company's Chairman and CEO Mark T. Bertolini.

Mr. Casazza joined Aetna’s Law & Regulatory Affairs department in 1992. Mr. Casazza was promoted to Vice President and Deputy General Counsel in 1997 and to Corporate Secretary in 1999. He has been General Counsel since 2005.

Previously, Mr. Casazza was engaged in the private practice of law with Sullivan & Cromwell, a Wall Street law firm, specializing in corporate/securities law matters and mergers and acquisitions. Prior to that, Mr. Casazza was a Certified Public Accountant with Ernst & Young.

Mr. Casazza holds a Bachelor of Arts degree cum laude from Tufts University; a Masters of Business Administration with high distinction from the University of Notre Dame Graduate School of Business Administration; and a Juris Doctor, magna cum laude, with distinction in all subjects, from Cornell Law School.

Richard di Benedetto

Richard di Benedetto

Executive Vice President
Aetna International

Richard di Benedetto is Executive Vice President, Aetna International. In this role, Mr. di Benedetto has responsibility for one of the largest global health benefits businesses, serving more than 500,000 members living and working in nearly every country in the world. Aetna International provides expatriate health benefits and collaborates with health care systems, government entities and plan sponsors to design locally appropriate solutions to measure and manage wellness, and improve health, quality and cost outcomes worldwide.

Mr. di Benedetto came to Aetna in June 2013 from Euromedic International, where he served as chief executive officer for one of the largest European private medical services providers in the field of diagnostic services, laboratories and cancer treatment. Euromedic operates 130 centers in 15 countries and employs more than 3,000 people. Joining Euromedic in 2010, he successfully oversaw a transformation of the company internally and externally in just three short years with a focus on organic growth in priority countries.

Prior to Euromedic, Mr. di Benedetto spent 15 years with GE Healthcare. During his time with GE, he held a variety of leadership roles with increasing responsibility, including general manager, Medical Systems, for Eastern European Operations, and vice president Sales Europe, Middle East, and Africa for the Medical Equipment division. Most recently he served as the president and chief executive officer of their Eastern and Africa Growth Markets. Based in Istanbul, he grew the business 27 percent in the first year and expanded the company’s global footprint (80+ countries) in emerging markets through a combination of organic and inorganic growth.

Mr. di Benedetto also worked for the Econocom Group SA based in France and Germany from 1987 to 1994.

Mr. di Benedetto studied economics at ‘Institut d’Etudes Politiques de Paris’ and graduated with a bachelor’s degree in economics in 1986. He and his wife, Brigitte, have two children.

Shawn M. Guertin

Shawn M. Guertin

Executive Vice President
Chief Financial Officer and Chief Enterprise Risk Officer

Shawn M. Guertin, Executive Vice President, Chief Financial Officer and Chief Enterprise Risk Officer, joined Aetna in April, 2011.  In his current position, Mr. Guertin is responsible for leading all of the corporation’s financial activities including planning and performance management, risk management, financial reporting, investment management, treasury and capital planning, tax, investor relations, corporate actuarial and underwriting and the Business Segment Finance organization.  He is a member of Aetna’s Executive Committee, the senior governing body of the company, and is a key strategic contributor.

Prior to his current role, Mr. Guertin served as head of Business Segment Finance where he was responsible for providing leadership to the finance teams supporting each of Aetna’s primary businesses.

Prior to joining Aetna, Mr. Guertin served as Executive Vice President, Chief Financial Officer and Treasurer of Coventry Health Care Inc. (NYSE: CVH).  He was responsible for financial reporting, investor relations, mergers & acquisitions, treasury and capital planning, actuarial and underwriting, risk management, tax, budgeting and planning, and real estate and procurement.  During his career with Coventry, He was also the Chief Actuary.  Mr. Guertin's previous experience includes leadership roles at United HealthCare and Travelers.

Mr. Guertin graduated summa cum laude with distinction from Boston University where he received his Bachelors of Arts degree in Mathematics.  He is a Fellow, Society of Actuaries and a member of the American Academy of Actuaries.

Steven B. Kelmar

Steven B. Kelmar

Executive Vice President
Corporate Affairs
Chief of Staff to Aetna's Chairman

Steven Kelmar is Executive Vice President, Corporate Affairs, and he serves as Chief of Staff to Aetna's Chairman. Mr. Kelmar is head of Aetna's government, regulatory and policy teams; head of enterprise strategy; and head of Communications and the Aetna Foundation. He is responsible for managing the Chairman’s office, as well as leading critical external initiatives related to health care reform and legislative affairs, communications and philanthropy. He reports directly to Chairman and CEO Mark Bertolini and serves on the Company’s Executive Committee.

Prior to Aetna, Mr. Kelmar was head of Global Public Affairs and Policy for Merck and Co., and also served in that capacity for Novartis AG, in Basel, Switzerland. In these roles, he was responsible for setting and driving the public affairs and policy strategies globally for these companies.

Before joining Novartis he served as Senior Vice President, External Relations for Medtronic Inc., for nine years. In this role he led efforts to establish the company as a leading health care technology company. He also had responsibility for corporate planning and established business initiatives that lead to strengthening the company's therapeutic franchises. Mr. Kelmar also served on the Executive Committee at Novartis and Medtronic.

Mr. Kelmar spent 14 years in public service in several executive positions. In 1990, he was appointed by President Bush and confirmed by the U.S. Senate to be an Assistant Secretary at the U.S. Department of Health and Human Services. In this position, he served as one of the federal government's chief policymakers during a time of major national reexamination of health care delivery systems.

During his public service career, Mr. Kelmar was Chief of Staff to two Members of the U.S. Congress and also worked in several legislative capacities for Members of the U.S. Senate and House of Representatives. He has served on the board of several health care companies.

Mr. Kelmar received his Bachelor of Arts in public administration and economics from Pennsylvania State University. He and his wife Patricia have three children.

Dijuana Lewis

Dijuana Lewis

Executive Vice President
Consumer Products and Enterprise Marketing

Dijuana Lewis is Executive Vice President, Consumer Products and Enterprise Marketing. In this new role for Aetna, Ms. Lewis is responsible for aligning consumer-focused businesses, products, services and capabilities to deliver a personalized, end-to-end consumer experience that positions the company for long-term growth. She reports directly to Aetna's Chairman and CEO Mark T. Bertolini and is a member of Aetna’s Executive Committee.

Ms. Lewis came to Aetna from Walmart, where she most recently served as senior vice president of Healthcare Solutions. She was responsible for pharmaceutical benefits and strategic planning in the health care space for Walmart U.S., acquisition of new customers, cost reduction and access to health care and services to help members live healthier lives.

Before her time at Walmart, Ms. Lewis spent 16 years at Wellpoint where she most recently served as president and CEO of the Comprehensive Health Solutions Business Unit, which includes Wellpoint’s provider relations, care and disease management, imaging management, information management, personal health guidance companies and the pharmacy solutions group. At Wellpoint, she also served previously as president of Local Group Business, president of the Northeast Markets, vice president of the Indiana Health Services Area, chief operating officer of Accordia Health Care Solutions, and vice president of Anthem Network Development.

Ms. Lewis is a member of the Go Red for Women (American Heart Association) Executive Committee, serving as 2012-13 Chair Person; a member of the National Hispanic Health Foundation Board of Directors; and is a Sponsor of Humanitarian Relief Efforts, the Kuaba Foundation.

Ms. Lewis has a bachelor’s degree from Indiana University and an MBA from Indiana Wesleyan University. She is married with two children.

Meg McCarthy

Meg McCarthy

Executive Vice President, Operations and Technology

Meg McCarthy is Executive Vice President, Operations and Technology.  She is responsible for information technology, service operations, global security, data analytics, procurement, and real estate services for Aetna.  She is a member of Aetna’s Executive Committee, the senior governing body of the company, reporting directly to Aetna's Chairman and CEO Mark T. Bertolini. 

Ms. McCarthy has served as Chief Information Officer and Vice President and Head of Business Solutions Delivery at Aetna, where she was responsible for the delivery and production support of information technology and business process improvement initiatives.  

Prior to joining Aetna in 2003, Ms. McCarthy was Senior Vice President of Information Technology at CIGNA Healthcare and served as Chief Information Officer at CHI Franciscan Health. Ms. McCarthy also worked in technology consulting at Andersen Consulting (Accenture) and was a consulting partner at Ernst & Young.

Ms. McCarthy has been recognized as one of Insurance & Technology's “Elite 8” and Computerworld’s Top 100 leaders. She serves on the board of directors of First American Financial Corporation.  Ms. McCarthy represents Aetna on the Council on Affordable Quality Healthcare (CAQH) where she serves on the executive, finance and nominating committees and she also sits on the World Economic Forum Gender Parity Council.

Ms. McCarthy holds a bachelor's degree from Providence College and a master’s degree in public health, hospital administration, from Yale University. Her military experience includes U.S. Navy Medical Services Corps, Lieutenant at Bethesda Naval Hospital, and U.S. Navy Reserves, Lieutenant Commander.


Harold L. Paz, M.D., M.S.

Harold L. Paz, M.D., M.S.

Executive Vice President and Chief Medical Officer

Harold L. Paz, M.D., M.S., is executive vice president and chief medical officer for Aetna. He leads clinical strategy and policy at the intersection of all of Aetna’s domestic and global businesses. He is responsible for driving clinical innovation to improve patient experience, quality and cost in all areas of the health care delivery system.

Before joining Aetna, Dr. Paz served as chief executive officer of Penn State Hershey Medical Center and Health System, senior vice president for Health Affairs for Penn State University, dean of its College of Medicine and professor of medicine and public health sciences for eight years. Prior to his appointment to Penn State, he served as dean of the Robert Wood Johnson Medical School and chief executive officer of Robert Wood Johnson University Medical Group, the largest multispecialty group practice in New Jersey, and professor of medicine. During his tenure at Penn State, Dr. Paz initiated the formation of the Penn State Hershey Health System, which includes four hospitals, 64 ambulatory care practices and 18 affiliated hospitals. 

Dr. Paz has focused his medical practice on pulmonary medicine with a special interest in patients with sarcoidosis. His research looks at critical care clinical outcomes, health system organization, and health care effectiveness. A pioneer in the field of quality management, Dr. Paz was among the first to study clinical outcomes in the intensive care unit. From this early work, he recognized the need to formally train physicians in quality, and in 1993 he started the first fellowship of its kind in quality management.  

Dr. Paz is chair of the Board of Directors of the Association of Academic Health Centers and a member of the Association of American Medical Colleges (AAMC) and the University Health System Consortium board of directors. He is chair of the AAMC Council of Deans administrative board and has served on the AAMC executive council. A former trustee of the Dorothy Rider Pool Health Care Trust, he has served on corporate and scientific advisory boards in the biotechnology field. Dr. Paz has authored more than 85 publications, including peer-reviewed research and quality articles, chapters, commentaries and abstracts. He also is the recipient of numerous awards, including the Sir William Osler Humanitarian Award from the American Lung Association of New Jersey, the Alumni Merit Award from Northwestern University, the Honorary Alumni Award from the Robert Wood Johnson Medical School and an honorary degree from Elizabethtown College. A member of the Gold Humanism Honor Society, he is a fellow of the American College of Physicians and the American College of Chest Physicians. Dr. Paz recently joined the Board of United Surgical Partners International. 

Dr. Paz received a bachelor's degree in biology and psychology from the University of Rochester, a master of science in life science engineering from Tufts University, and his medical degree from the University of Rochester School of Medicine and Dentistry. He completed his internship and residency at Northwestern University, where he served as chief medical resident and instructor in clinical medicine. He was a Eudowood Fellow in pulmonary and critical care medicine at Johns Hopkins Medical School. In addition, he was a post-doctoral fellow in environmental health science at Johns Hopkins School of Hygiene and Public Health.

Fran S. Soistman

Fran S. Soistman

Executive Vice President
Government Services

Fran S. Soistman is Executive Vice President of Aetna and head of the Government Services segment. He is responsible for driving growth in the company’s Medicare, Medicaid and Public & Labor businesses, including the Federal Employees Health Benefits Program (FEHBP) business.

Mr. Soistman has nearly 30 years of experience in health insurance and managed care. Prior to joining Aetna, he was Executive Vice President, Chief Operating Officer and co-founder of Jessamine Healthcare, a firm focused on strategic investment opportunities in the health care industry. Before his tenure at Jessamine, Mr. Soistman held several senior leadership positions at Coventry Health Care, including Executive Vice President for the Individual Consumer and Government Business Division. In this role, he was responsible for the company’s individual Medicare Advantage, Medicare Part D, Medicaid and commercial individual products, which served more than 2.5 million members across the United States.

In June 2004, Mr. Soistman was a recipient of the Ernst & Young Entrepreneur of the Year award in the Healthcare Technology/Services category. From 2004 to 2008, he served on the Pennsylvania Health Care Cost Containment Council, providing direction for the state agency charged with addressing growing health care costs.

Mr. Soistman serves on several boards, including the University System of Maryland Foundation Board of Directors, Penn State Hershey Medical Center Development Board, Penn State University Presidential Leadership Academy Board of Directors, and Towson University Board of Visitors.

He holds a bachelor’s degree in accounting and finance from Towson University and is a graduate of The Stanford University Executive Program.

Joseph M. Zubretsky

Joseph M. Zubretsky

Senior Executive Vice President

Joseph M. Zubretsky is the Senior Executive Vice President of Aetna’s Healthagen® business, leading the company’s provider contracting, collaboration and enablement businesses, as well as its national care management practice. Mr. Zubretsky is a member of Aetna’s Executive Committee, the senior governing body of the company.

In this role, Mr. Zubretsky is responsible for driving transformation and growth through collaboration with and service to providers, one of the three key pillars of the company’s strategic roadmap.  Healthagen’s innovative portfolio comprises businesses that deliver population health and technology services to leading provider organizations, employers and consumers. It includes national network contracting, Accountable Care Solutions, and other value-based contracting services; ActiveHealth Management; Medicity; and other new and emerging solutions.  In addition, Mr. Zubretsky is responsible for Aetna’s national care management practices, responsible for supporting the delivery of efficient, quality care for Aetna members.  

Prior to this role, Mr. Zubretsky served for two years as head of Aetna’s National Businesses, which included Healthagen, the company’s National Accounts business, and several specialty products. Before that, he served for six years as Aetna’s Chief Financial Officer, and was also responsible for enterprise strategy and corporate development.  Before joining Aetna, Mr. Zubretsky had 25 years of experience as a senior executive in strategy, operating, and finance roles in some of the world’s top companies including Unum Group and MassMutual Financial Group. Mr. Zubretsky started his career at Coopers & Lybrand, where he was a senior partner in their national insurance industry group.


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