Rotating intern Winnipeg General Hospital, 1965-1966, assistant resident in medicine, 1966-1967, resident in critical care medicine, 1968-1969. Assistant resident medicine Cleveland Metropolitan General Hospital, 1969-1970, resident-in-charge pulmonary disease section, 1970-1971, chief pulmonary division department medicine, 1977-1988, associate director department medicine, 1981-1988. Fellow pulmonary disease section Hospital University Pennsylvania, Philadelphia, 1971-1973, co-director respiratory Intensive Care Unit, 1973-1974, director diagnostic services, 1973-1977.
Associate in medicine University Pennsylvania School Medicine, Philadelphia, 1973, assistant professor medicine, 1973-1977. Associate professor medicine Case Western Reserve University School Medicine, Cleveland, 1977-1984, professor medicine, since 1984. Chief of staff Department Veterans Affairs Medical Center, 1988—1996.
Manager medical-surgical specialties care line Veterans Healthcare Systems Ohio, since 1996. Associate dean Veterans Hospital Affairs, since 1988. Attending physician pulmonary in-patient service medical Intensive Care Unit and Pulmonary Consultant Service Cleveland Metropolitan General Hospital, 1977-1978, medical director respiratory therapy department, 1977-1988, director respiratory Intensive Care Unit, 1977-1981, attending physician medical Intensive Care Unit University Hospitals, Cleveland, since 1978.
Member medical research service review board for respiration VA, 1986-1989. Special reviewer National Institutes of Health Clinical Science, 1985, 88. Consultant special emphasis panel National Institutes of Health National Heart, Lung and Blood Institute, 1996.
Temporary member National Institutes of Health Respiratory and Applied Physiology Study Section, 1996. Attending physician respiratory Intensive Care Unit Veterans Administration Medical Center, Cleveland, since 1988, attending physician medical service, 1988. Lecturer in field.
Trustee Northeast Ohio affiliate American Heart Association, 1993-1998, member research allocation committee, 1989-1993. Member American Federation Clinical Research (member program 1982, steering committee section on respiratory pathophysiology 1981-1982, chairman section 1982-1984, member program and awards committees annual science assembly 1985), American Thoracic Society (program committee science assembly on respiratory structure and function 1989-1990), Ohio Thoracic Society, American College Chest Physicians (governor Ohio 2001-2003, program committee, awards committee annual science assembly 1985), American Physiological Society, American College Physician Executives, American Heart Association, National Association VA Chiefs of Staff (president elect 1996, president 1997-1998).