He later became Northeast Ohio manager of the Equitable Life Assurance Society of New York, working there for fourteen years until he resigned and went to Europe to improve his health.
He was also a director of the First National Bank and an executive committee member of the Guardian Savings and Trust Company.
He also founded the Federation of Charity & Philanthropy in 1913 and chaired its Committee on Benevolent Associations of the Chamber of Commerce.
[4] By 1905, Marks was a director of the Cleveland Jewish Orphan Asylum, a trustee of the National Jewish Hospital for Consumptives in Denver, Colorado, chairman of the Cleveland Chamber of Commerce Committee on Benevolent Association, an executive board member of the Cleveland Council of Sociology, vice-president of the Anti-Tuberculosis League, an executive board member of the Municipal Association and the Public Library Board, treasurer of the Covenant Endowment Fund of the B'nai B'rith Grand Lodge No.
Rabbi Moses J. Gries conducted a private funeral service for the immediate family at the family home, while former Jewish Orphan Asylum superintendent Samuel Wolfenstein officiated a public funeral in the Mayfield Cemetery chapel, which was overcrowded to the point where many attendees had to stand outside the chapel.