After that he was appointed Associate Professor at Leiden University in the Department of Anthropology.

In 1961, he was appointed by the university as a Research and Information Officer in the Department of External Studies.

He was appointed a deputy commissioner in the Department of Investigation in 1978 and Finance Commissioner in 1989.

He was then appointed Minister of State in the Department of Health in the coalition government.

In 2003 Lammy was appointed as a Minister in the Department for Constitutional Affairs.

He was then appointed as a junior minister in the Department of National Heritage, serving until the Conservatives lost office at the 1997 general election.

In 1884 he was appointed Superintendent of Music in the Department.

In 1974, he was appointed as a Research Fellow in the Department of Engineering at the University of Cambridge.

After two years he was appointed lecturer in the Department of Mathematics.

In 1995, he was appointed to the faculty as a Distinguished Service Professor in the Department.