Issac Newton Failor (1851-1925) was a mathematician and astronomer who served as the first principal of Richmond Hills High School.

Born in Ohio on February 9, 1851, Failor graduated from Ohio Weslyan University in 1875. Before Richmond Hill, he worked at schools in Alabama, New Orleans, Long Island, and Brooklyn. Richmond Hills High School opened in 1897, and when it expanded to its current spot not long after, its astronomy observatory and telescope, spearheaded by Failor and built at a cost of $6,000, was its crown jewel. RHHS publications were still called “The Dome" long after it was demolished to accommodate an even larger school, where the library is named for Failor.

Failor retired in 1917, after which point he spent much of his time cultivating dahlias and roses. At the time of his passing on April 2, 1925, he lived with his wife Eva at 8424 113th Street. Failor, his wife, and his children are interred in a plot in Maple Grove Cemetery in Kew Gardens.