Dr. Karl received an acommodation letter for outstanding service from The US Army after two years at Fort Benning Georgia. He has served as assistant clinical professor in the graduate periodontics department at Tufts Dental School as well as University of Connecticut School of Dental Medicine. He has also been a visiting lecture at The University of Iowa Department of Periodontics.
Dr. Karl and Dr. KennethKornman published one of the firstpapers on the use of antibiotics in the treatment of periodontal disease. This was based onDr.Karl's long termuse of antibiotics in his clinical practice.