In 1938, Rosenheim was awarded the Bilton Pollard Travelling Fellowship and worked as research assistant for Dr Fuller Albright at the Massachusetts General Hospital.

From 1945 to 1946, Rosenheim was consultant physician to the Allied Land Forces in South East Asia.

[7] In 1966, he was elected President of the Royal College of Physicians (PRCP), a position he held until his death in 1972.

In 1972, a few months before he died, he was elected under Statute 12 a Fellow of the Royal Society (FRS).

[11] Sir Max was created a life peer on 31 July 1970 taking the title Baron Rosenheim, of the London Borough of Camden.