Dr. William Rassman founded NHI Medical in 1992 and quickly became a world leader in hair transplant technology, enabling surgeons to perform hair transplants with large numbers of very small grafts in single surgeries that looked totally natural for the very first time. He presented his breakthroughs at medical meetings around the world and published them in medical journals and in text books.

Dr. Rassman pioneered the large session hair transplants as he was the first to perform 2000, 3000, and 4000 grafts in single session. The Follicular Unit Transplant (1995) and The Follicular Unit Extraction technology (2002) was pioneered by him.

He is a professional inventor and holds more than 3 dozen patents which defined new ground in various fields. His greatest accomplishment was the commercialization of the Intra-aortic Balloon pump. This device is now used as the standard heart assist pump in every coronary care unit in the world, saving thousands of lives every year.

Dr. Rassman was educated in medicine and surgery at the Medical College of Virginia, the University of Minnesota, and Cornell Medical Centers. He did a cardiovascular fellowship with Dr. C.W. Lillehei, the man who invented modern heart surgery. He served in the U.S. Army, reaching the rank of Major and served as a war surgeon in the Republic of Vietnam. The American Board of Surgery certified Dr. Rassman in 1976.

Over the past 24 years, his curiosity led him to develop and patent surgical tools for hair transplantation (16 patents) and the use of a robot for hair transplantation (now the commercial ARTAS System). He presents scientific papers before national and international societies on a yearly basis, as well as writing chapters in textbooks in the fields of cardiology and hair replacement. He is the primary author of Hair Loss and Replacement for Dummies.

Dr. Rassman has been recognized for contributions nationally and internationally in various fields. In 2003 he received the most prestigious award in the field of hair replacement, the Golden Follicle Award. He was also named the most outstanding hair transplant surgeon worldwide by the International Society for Hair Transplant Surgeons.