He became a councillor in
North York, Ontario eventually becoming
reeve from 1957 to 1958. He ran for the leadership of the
Ontario Liberal Party at the 1958
Ontario Liberal leadership convention, placing fourth. He was elected to the
Legislative Assembly of Ontario in the
1959 provincial election. Singer became deputy leader of the Ontario Liberal Party and, as a
Member of Provincial Parliament (MPP), pushed for reforms to municipal law,
automobile insurance and electoral laws as well as for the establishment of a provincial
ombudsman. 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. Singer was deputy leader of the Liberals from 1966 until 1973, when he was asked to step down by leader
Robert Nixon, after he filed the lawsuit but was allowed to remain in the
shadow cabinet. Singer was re-elected to the legislature on four successive occasions before retiring in 1977. His retirement was controversial as he announced it on the eve of that year's election campaign without giving his Liberal colleagues advance notice. The Progressive Conservatives won Singer's previously safe seat in the election and, the next year, the government appointed Singer to the first of five two-year terms on the
Ontario Municipal Board including several years as its chairman. 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. ==Later life==