Robert Johannes "Bob" Sindorf was born in Amsterdam in 1951 and emigrated to the USA with his family in 1951. He grew up in Little Falls, New Jersey and graduated from Columbia College in 1974. While still at Columbia, Sindorf worked with Charles LoBue at Guitar Lab in New York City on the weekends and between classes. Sindorf had started to make guitars in his bedroom as a child and originally came into LoBue's shop looking for a part to complete a guitar that he was building in his dorm. Sindorf continued to work with LoBue through 1976 when he began grad school, At Guitar Lab he worked alongside the likes of Larry Dimarzio, Steve Blucher, Sherwood T. “Woody” Phifer, and  Ralph Novak. Bob went on to receive a Master's Degree in 1977 from the Columbia School of Architecture. Besides guitar making (& his family) his passions included architecture and sculpture and these became the focus of his later career. Bob Sindorf passed away suddenly on December 22, 2008. He was 57 years old.

Source: Robert Sindorf obituary. The Journal News on Dec. 24, 2008

Source: LoBue Guitars history (12 December 2018)