Frank M. Groendyke lived most of his life in Mendham and operated a plumbing business at 7 West Main Street. He was chairman of the Sinking Fund that was formed in connection with the Water Department. Groendyke served as president of the Board of Health for 35 years, was a member of the Board of Education, charter member of the Fire Department, and for 14 years, the president of the Free Library.