Benjamin M. Rosen a Wall Street analyst and venture capitalist, whose early efforts to rally investors behind companies like Apple, Lotus and Compaq, made the promises of personal computing a reality, died on August 23 in Manhattan. He was 93.

            There are many gods in the pantheon of the personal computer: Bill Gates for software, Andy Grove for processors, and Steve Jobs for design, and Mr. Rosen for marshaling the financial resources necessary to help the industry take off.

            During the early 1990s, Mr. Rosen and his brother Harold founded Rosen Motors to bring a new type of car engine to market. The engine, based on a hybrid-electric powertrain, showed promise, but was ahead of its time. The company closed in 1997.

            Today, many electric/hybrid cars use engines similar to the one the Rosen brothers developed.