IRIS Leadership


David E. Clark

David is the firm's president and co-founder, runs the day-to-day operations IRIS. Mr. Clark has worked in Federal healthcare for over 15 years as a coporate executive, industry liaison and managment consultant.

Mr. Clark is also a veteran of five technology start-ups including two HIT firms. He has served as the Director of Integration & Interoperability for the Health Information Management & Systems Society (HIMSS) where he planned and built the Regional Health Information Organization (RHIO) Federation and was the liaison for the Integration & Interoperability Steering Committee which studied the business and technical aspects of bi-directional health information exchange. He led the RHIO Guidebook work group, the HIT Definitions work group, the HIT Position Statements work group, and the HIT Special Projects work group, which focused on e-authentication best practices for exchanging patient health information.

Mr. Clark also chaired the national RHIO Federation Roundtable comprised of 40 state representatives and was instrumental in the development of the HIT Dashboard, created in conjunction with the University of Maryland, Center for Health Information & Decision Systems. These activities focused on the technical, business and patient aspects of the National Health Information Network (NHIN).

Mr. Clark has been a member of the Board of Directors of the National Capital Area HIMSS Chapter, serving for seven years as Secretary, Vice President, President and Previous Past President. Mr. Clark speaks nationally on the topic of interoperability and his lectures have been incorporated into undergraduate and graduate courses at Georgetown University.



John A. (Pete) Williams, Ph.D. 

John A. (Pete) Williams, Ph.D., FACHE, is a founding partner of IRIS. He supports the company's strategic direction and leads the firm's board of directors.  Dr. Williams holds a Ph.D. in Health Services with an emphasis on organizational behavior and has over 40 years of comprehensive executive leadership experience in program and project management, business development, strategy analysis, and change management. He is an expert on the functional, technical, and financial management aspects of complex IS/IT programs and has successfully executed multi-million dollar projects, responsible for the recruitment, supervision, training, and evaluation of subject matter experts. He has led multidisciplinary technical and business personnel through systematic evaluations of health information system processes for the strategic IT infrastructure of the Veterans Health Administration (VHA).

Dr. Williams recently led a worldwide pre-implementation of a Medical Human Resources System with 170,000 users at over 650 sites; a major responsibility was to ‘train the trainers’ to fully understand the functional business processes from a service specific perspective.

Dr. Williams is a former associate lecturer for the Department of Management Science, School of Business and Public Management at George Washington University, where he designed masters level course curriculums for Information Systems (IS) professionals.  He is a former adjunct professor at the Department of Nursing and Health Systems at Georgetown University, where he created undergraduate and graduate level courses. He has also taught in the Organizational Theory and Behavior graduate degree program at Georgetown University.

As a doctoral candidate, Dr. Williams developed a model of healthcare utilization from the patient’s perspective by comparing alternative system approaches and postulated that a policy of intervention is the most effective method for managing patient demand, expectations, and behavior.

Dr. Williams is a founding member of the HIMSS NCA Chapter, serving as its President, and is a former member of the HIMSS Advocacy and Public Policy Steering Committee. He is also a Fellow of the American College of Healthcare Executives (FACHE).


Roger D. McCreery

Roger D. McCreery is IRIS' Chief Technology Officer (CTO) and has been consulting on health information technology (HIT) projects for more than 30 years, working for commercial, non-profit, and government entities, including federal, state, and local governments. An industrial engineer by training, Mr. McCreery's career has focused on healthcare, IT systems, program and project management, supporting processes, and enterprise organizational strategies.

As IRIS’s resident expert in health information interoperability, Mr. McCreery's work focuses on Federal health agency initiatives.  For IRIS clients, he leads mission critical programs related to the planning, development, and adoption of the technologies that establish bi-directional health information exchange. 

He has worked as a project manager on numerous Department of Health and Human Services (HHS), Department of Veterans Affairs (VA), and Department of Defense (DoD) health initiatives. For example, Mr. McCreery supported the HHS Office of the National Coordinator for Health Information Technology (ONC), where he helped develop and propagate health information interoperability standards and supported technical policy development related to HIT and the National Health Information Network (NHIN). 

As the systems engineering lead for IRIS's engagement on DoD Military Health System (MHS) projects, he supports the development and implementation of the largest global electronic health records (EHR) system in the world.