With his half-brother David Lubin, He was also an investor in the Weinstock, Lubin Real Estate Company; the Weinstock, Nichols Company; and the National Bank of D. O. Mills. He also served on the executive committee of the
National Civic Federation, which attempted to alleviate conflict between employers and labor unions. Weinstock drafted the Weinstock Arbitration Bill of 1911, which prohibited strikes and lockouts during the arbitration process. In 1912, Weinstock was appointed by Governor
Hiram Johnson to investigate the
San diego free speech fight. By 1915, Weinstock was appointed as first director of the State Market Commission of California. As Commissioner, Weinstock imposed regulations on the citrus and poultry industries, ensuring that farmers were paid their fair share and helping the industries with marketing. He also established the State Fish Exchange. He resigned in January 1920. Weinstock served as the vice president of the
Jewish Publication Society. He was also a member of the Jewish Historical Society. ==Personal life and death==