He maintained a private practice until last year and taught internal medicine at the medical school from 1927 to 1973.
Over the years, his medical career included internal medicine, public health and psychiatry.
He is also a medical doctor with a post graduate degree in internal medicine.
So I went to see a renowned expert in internal medicine.
For many years he was a clinical professor of internal medicine at Georgetown.
He was then asked to spend a year teaching residents there as chief medical resident in internal medicine.
He specializes in internal medicine and could not be reached for comment.
This was made evident to me during my training as a resident in internal medicine.
"That would be contradictory to the profession of internal medicine."
Others of you will be going into internal medicine.
In 1992, only 14.6 percent of medical students decided to go into general medicine, an all-time low.
However, it was not until 1967 that complete training in general medicine started.
Rentler went on to medical school and continued to practice general internal medicine for several years.
This axis is similar to what would be considered an illness or disease in general medicine.
He had little interest in general medicine, and decided to become a psychiatrist.
How a contract could be agreed for, say, general medicine, other than on a population basis is difficult to envisage.
The faculty also offers a specific training in general medicine.
This is what occurs in general medicine in most countries.
"I've been very happy, but you have to love people to do general medicine," she said.
These professionals have had advanced training in many aspects of general medicine.