Part-time private practice of internal medicine            

      1971 to 1977

and full-time  academic  appointment           

(Columbia University)            

Full-time private practice of internal medicine and            

      1977 to 1989

medical  genetics and part-time academic appointment            

(Columbia University)            

Part-time private practice of internal medicine and            

       1989 to 1991

medical genetics and part-time academic appointment           

(Columbia University)            

Full-time institutional practice of internal medicine           

       1991 to 1993

and medical genetics           

(Professional Service Centers for the Handicapped            

189-15 Station Road           

Flushing, N.Y. 11358) and            

part-time academic appointment            

(Columbia University)            

Part-time health care administration and practice of            

       1993 - Aug. 1998

internal medicine in an Article 28 diagnostic and            

treatment facility (Medical Director, Ambulatory            

Health Care Center of Washington  Heights -West            

Harlem-Inwood Mental Health  Council, Inc. ; a.k.a.           

Council Health Center of  Heritage Health and           

Housing, Inc; a.k.a. Heritage Health Center,            

1727 Amsterdam Avenue, New York, N.Y. 10031) and            

part-time private practice of           

internal medicine, and           

part-time academic appointment           

(Columbia University)            

Full-time private practice of internal medicine, and            

       Sept. 1998 -

part-time academic appointment           

(Columbia University)