[1] After serving in World War II with the Royal Canadian Dragoons, Singer returned to Canada and became president of the Young Liberals in 1947.
He served as Liberal House Leader in the 1970s and, in 1973, sued fellow Liberal MPP Eddie Sargent for libel after Sargent made remarks about Singer's retainer fee from a developer while he was appearing before a legislative committee to explain how he obtained the contract to build Ontario Hydro's new headquarters in Toronto.
His retirement was controversial as he announced it on the eve of that year's election campaign without giving his Liberal colleagues advance notice.
[5][6] The incident resulted in accusations by NDP MPP Ed Ziemba that the government had bought Singer's seat, and that of fellow Liberal Philip Givens who left in similar circumstances, through political patronage.
[7] Following his retirement from the Ontario Municipal Board in 1989, Singer won election to North York's committee of adjustment filling a seat vacated by Patti Starr when she was forced to resign as the result of a wider political scandal.