According to the Internet source given below, Thomas Andrew Lehrer is a retired American musician, singer-songwriter, satirist, and mathematician. He has lectured on mathematics and musical theater. He is best known for the pithy, humorous songs that he recorded in the 1950s and 1960s. His songs often parodied popular musical forms, though he usually created original melodies when doing so. A notable exception is The Elements set to the tune of the "Major-General's Song from Gilbert and Sullivan's Pirates of Penzance.
Lehrer's early work was noted for its black humor in songs such as Poisoning Pigeons in the Park and The Irish Ballad. In the early 1970's he retired from public performances to devote his time to teaching mathematics and music theater at the University of California, Santa Cruz.

Websites:
	Tom Lehrer	Biography by wikipedia.org.