 Weinberg started with Goldman Sachs as a $3/week janitor's assistant, where his responsibilities included brushing the firm's partners’ hats and wiping the mud from their overshoes.The grandson of the firm's founder, Paul J. Sachs, liked Weinberg, and promoted him to the mailroom, which Weinberg reorganized.To improve Weinberg's penmanship, Sachs sent him to Brooklyn's Browne's Business College.