From the year 1986, he has been the Professor of Internal Medicine. He belongs to the faculty of Gastroenterology, Nutrition, Metabolism, and Endoscopy at the University of Giessen, Germany.
During the years 1971 to 1978, he was an Assistant Professor of Medicine at the University of Ulm which is situated in Germany. He was a member of the department of Division Nutrition, Metabolism and Gastroenterology. This department head was Professor H. Ditschuneit.
The University of Ulm was very lucky to have Professor Dr. Hans- Ulrich Kloer as the Associate Professor of Medicine during the years 1978 to 1980.
He was also an Attending Physician in the Division of Nutrition, Metabolism and Gastroenterology Head, Endoscopy Unit of University Hospital, Ulm, Germany. He was a physician for a year.
He also was an assistant member of the Lipoprotein and Atherosclerosis Research Program. This program was initiated by the Oklahoma Medical Research Foundation, which is situated in Oklahoma City, USA. He was a member of this program for the duration of about six years, starting from the year 1980.
From the years 1980 to 1986 he had a lot of successes. He was the trial physician in the Lipid Research Clinics. He specifically worked in the Coronary Primary Prevention Trial (LRC – CPPT) of the NIH at the Oklahoma Lipid Research Clinic, Oklahoma Medical Research Foundation. In those years he also happens to become the Associate Professor of Medicine, University of Oklahoma College of Medicine, Oklahoma City, USA.
Prof. Dr. Hans- Ulrich Kloer was also affiliated with Metabolism and Gastroenterology Presbyterian Hospital, Oklahoma Memorial Hospital & Clinics, and Oklahoma City Veterans Administration Medical Center.
He also worked in the Department of Nutrition in the Oklahoma Memorial Hospitals & Clinics and Oklahoma City Veterans Administration Medical Center during the same time duration.
His discovery of the DLO did do wonders to the world today. His invention and research have played a huge role in the healthy population we have today. He has worked extremely hard to achieve his goals which have benefited the whole world. His invention can never be forgotten. He has left a huge mark on medical science history.