Sebastian Leone was borough president

Borough president

Borough President is an elective office in each of the five boroughs of New York City.-Reasons for establishment:...

 of Brooklyn

Brooklyn

Brooklyn is the most populous of New York City's five boroughs, with nearly 2.6 million residents, and the second-largest in area. Since 1896, Brooklyn has had the same boundaries as Kings County, which is now the most populous county in New York State and the second-most densely populated...

 from 1970 to 1976.

In January 1977 Sebastian Leone was elected to the New York Supreme Court

New York Supreme Court

The Supreme Court of the State of New York is the trial-level court of general jurisdiction in thestate court system of New York, United States. There is a supreme court in each of New York State's 62 counties, although some smaller counties share judges with neighboring counties...

. He served in that capacity until he retired in January 2001.
He continues to reside in Brooklyn, New York.

The opening credits of the television show Welcome Back, Kotter

Welcome Back, Kotter

Welcome Back, Kotter was an American television sitcom starring Gabe Kaplan and featuring a young John Travolta.It originally aired on the ABC network from September 9, 1975 to June 8, 1979.-Premise:...

, which was set in Brooklyn, began with the image of a sign that read, "Welcome to Brooklyn, 4th largest city in America, Hon Sebastian Leone Borough President".