He was the Hungarian ambassador to Sweden between 1953 and 1955.

He was the Hungarian ambassador to the United States between 2002 and 2007.

The theatre was officially opened by the Hungarian Ambassador in 2008.

From 1960 to 1963 he was the Hungarian ambassador to the Soviet Union.

He also served as Hungarian Ambassador to Croatia from 1999 to 2003.

From 22 November 1919 he was the Hungarian ambassador to Austria.

He served as Hungarian Ambassador to the United Kingdom from 1990 to 1995.

That same year, Péter was named Hungarian ambassador to the United States.

He served as Hungarian Ambassador to Bulgaria from December 1975 until his death.

He was appointed Hungarian Ambassador to the United States of America in early 2011.