Career
A resident of the Riverdale section of the Bronx, Gerosa was a conservative Democrat who had been in the trucking industry before entering politics. After being jettisoned from the Democratic ticket in 1961 in favor of Abe Beame, he challenged incumbent mayor Robert F. Wagner, Junior. in 1961 as an Independent, proffering a fiscally conservative, law and order platform. He garnered 13% percent of the vote against Wagner and liberal Republican Louis Lefkowitz.
The Gerosa campaign would articulate many of the themes which would be used again in 1969, when another conservative Italian-American Democrat Mario Procaccino challenged John V. Lindsay for control of city hall.
Gerosa died of lung cancer at Albert Einstein Hospital in the Bronx.