In 1938, Rosenheim was awarded the Bilton Pollard Travelling Fellowship and worked as research assistant for Dr
Fuller Albright at the
Massachusetts General Hospital. Rosenheim joined the
Royal Army Medical Corps in 1941 and served in the Middle East and Italy, leaving the Army as a
brigadier. From 1945 to 1946, Rosenheim was consultant physician to the Allied Land Forces in South East Asia. From 1949 and for the next 21 years, Rosenheim was Professor of Medicine at UCH, resigning in 1960 but retaining his links with UCH, acting as a part-time physician. His own particular medical interests were
renal disease and
hypertension, and he was among the first in his profession to convince his fellows that hypertension could be treated. ==Awards and honours==