georgetown college-1958-59
georgetown medical 1959-63
columbia-presbyterian surg. intshp 1963-64
yale-new haven gen. & cardiothor residency 1964-69
the U. of Chicago asst,asso,prof cardiac surg. 1969-83
S.U.N.Y.Stony Brook prof & chief cardiac surg.1982-1991
St. Luke's-Roosvlt/Columbia prof / chair cardiac surg 1991-06
U. of Ioannina Greece prof & chair cardiac surg 1997-03
U. of Athens Greece prof & chair cardiac surg 2003-07
Columbia U clinical prof surg 2007-
adult congenital
aneurysms
complex - redo