Our Management


Hassan S. Sharif, MD

President and Chief Executive Officer

As President and Chief Executive Officer, Dr. Sharif was instrumental in establishing the physician-to-physician relationships of WorldCare’s second opinion service. His extensive experience and efforts have bridged the gap between U.S. medical practices and those of the world. He also leads WorldCare’s international consulting and management efforts while managing worldwide operations and shared services. He received his medical degree from the American University of Beirut, (AUB) School of Medicine. He completed his radiology training at AUB, the University Hospital of Wales in Cardiff, St. Bartholomew’s Hospital in London and Magnetic Resonance training at Emory University in Atlanta, Georgia and Case Western Reserve University in Cleveland, Ohio. He is a Fellow of The Royal College of Radiologists, London and is a sub-specialist in cross-sectional imaging, neuroradiology and the musculoskeletal system.


Michael Sullivan, CPA

Chief Financial Officer

Michael Sullivan manages the financial, accounting and treasury functions of WorldCare. Sullivan is a seasoned financial executive with years of diverse experience including raising capital, business valuation, strategic planning, cash management and company forecasting. Prior to joining WorldCare, Sullivan was the Chief Financial Officer for SEI and X-Collaboration Software Corp, an award-winning startup software company, which was acquired by Progress Software (NASDAQ:PRGS). Sullivan received a Bachelor of Arts in Economics cum laude from Yale University.

Andre M. Aoun, AIA

Senior Vice President, Consulting and Management

Mr. Aoun has over 30 years of experience focused on the design and implementation of health sciences projects and on practice building. During his career, he has worked with leading institutions worldwide and helped build the health practices of two prominent Boston firms into the highest ranking health practices nationally and globally. He had the privilege to lead the development of high profile projects such as the Shapiro Cardiovascular Center at Brigham and Women’s Hospital, the expansion of King Faisal Specialist Hospital, the leading academic medical center in the Kingdom of Saudi Arabia and the KOC University Health Sciences campus in Istanbul. Over the years, Mr. Aoun has performed consistently in the role of trusted advisor with all his clients. Through hands-on leadership and strategic guidance, he helps clients achieve their vision and goals by bringing together large and diverse groups of constituents, while navigating through today’s challenging environmental and economic realities. His background in innovative design and planning has allowed him to manage effectively the design process on some of the largest and most complex projects. Mr. Aoun’s genuine interest in clients, his ability to understand them, to manage the decision process and build consensus have always led to successful results and award winning projects.


Paul Clark

Chief Technology Officer

Clark leads all technology strategy and IT operations, while overseeing the development and implementation of software and systems. Additionally, he oversees WorldCare’s security and privacy compliance throughout the entire organization. Clark has over 27 years of technology and business experience including software, hardware, e-commerce, operations, sales, marketing, consulting, printing and records management. Prior to joining WorldCare, Clark held a number of senior technology roles in a variety of industries including printing and marketing services, managed services, datacenter and hosting, management consulting and meteorology. He received a Bachelor of Science in Meteorology from the University of Massachusetts Lowell.

Richard Heinzl

Global Medical Director

Richard Heinzl is a physician, humanitarian and entrepreneur whose current focus is technology and healthcare worldwide. He is Global Medical Director for WorldCare International, Inc. In this role, Dr. Heinzl provides consultation and oversight on the creation and delivery of medical second opinions to our members worldwide; engages with clients across North America and contributes to the strategic direction of the company. Earlier in his career Heinzl was the founder of Médecins Sans Frontières/Doctors Without Borders Canada (MSF Canada), which won the Nobel Peace Prize in 1999. He is a graduate of McMaster University’s DeGroote School of Medicine and completed postgraduate degrees related to global health at Harvard University and the University of Oxford. He is a Fellow of the American College of Preventive Medicine. In 2000 he received an Honorary Doctorate (LLD) from McMaster University and was named one of the “Hundred People Who Make a Difference” in Canada by Penguin Books. His Memoir, “Cambodia Calling” is published by Harper Collins.


Tina Karas

Vice President of Marketing

In her role as Vice President of Marketing, Karas develops and drives the marketing strategy for WorldCare International, Inc. while overseeing day-to-day marketing operations. She brings more than 20 years of expertise in marketing and communications to WorldCare International. Karas has extensive experience in project management, budget development and tracking and marketing campaign development, implementation and measurement. She received her Master of Business Administration and her Bachelor of Science from Salem State University. She began her career in the Financial Industry before making the switch to healthcare.


Karen Pfaff

Director of Nursing and Clinical Operations Manager

In this capacity, Pfaff oversees the nurse case managers, administrators and medical staff in several countries, while managing the day-to-day operations of WorldCare’s international services. A registered nurse, Pfaff has over 20 years of nursing experience including case management, home care, clinical and critical care. Prior to joining WorldCare, she was responsible for supervising clinical care for critically-ill patients in the Medical and Surgical Trauma ICU’s at Boston Medical Center and at St. Elizabeth’s Medical Center. Pfaff received Bachelor of Science in Nursing from Framingham State University and an Associate of Applied Science in Nursing from MassBay Community College.