Dr. Leonard Jason, Ph.D., is among the most prolific of all CFIDS researchers. For more than a decade, Dr. Jason and his team at DePaul University’s Centre for Community Research have worked to define the scope and impact of CFS/ME worldwide.

Dr Jason is Vice President of the International Association for Chronic Fatigue Syndrome (now the IACFS/ME) and has been a key driver of CFS research since 1991, and is uniquely positioned to support collaboration between CFS researchers, patients, and government decision makers. His studies have shown that the direct and indirect costs of ME/CFS amount to $20 billion in the U.S. each year, and more than 1 million people suffer from ME/CFS as opposed to the estimated 20,000 people originally reported by the CDC (Centers for Disease Control and Prevention).