 Until the end of his life Leavitt served in various volunteer capacities with the Protestant Episcopal Church for the diocese of New York, and was the longtime Senior Warden at St. Mark's Church in-the-Bowery in Manhattan's East Village.Leavitt was a founding director in 1891 of the East Side House, a settlement house on the East Side of Manhattan endowed by Charles B. Webster of R. H. Macy & Co.The House was designed to form a 'self-supporting club which should keep the workingmen off the streets and out of the saloons."