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Born in Philadelphia, PA.
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He entered the college and joined a work-study program involving engineering.
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He was a part of the Free Speech Movement as a teen.
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He was arrested during the Sproul Hall Sit-In at the University of California, Berkeley.
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He dropped out of college at the end of 1967.
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He worked as a Junior Engineer at the Ampex Corporation.
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After dropping out numerous times, he finally graduated with a degree in electrical engineering and computer science.
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He developed a time-shared public bulletin board system on an SDS-940 mainframe computer that cut costs and allowed open access.
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He was one of the original members of the Homebrew Computer Club, a computer hobbyist group, and he helped to control the meetings. These meetings started in 1975 and ended in 1986.
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He joined the Processor Technology Corporation with a position as a design consultant.
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Felsenstein's design of the Pennywhistle modem was featured on the cover of Popular Electronics.
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He developed the VDM-1, which was much cheaper that the glass teletype that was commonly used during his day.
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He developed one of the first microcomputers that included both the keyboard and case. This computer sold upwards of 10,000 units in three years between 1977 and 1979.
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Adam Osborne and Felsenstein developed a portable computer. This computer could fit under the seat of the airplane, and it easily became one of the most sold CP/M-based computers.
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With Reddy Information Systems, he designed the first wearable computer.
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He was named a "Pioneer of the Electronic Frontier" by the Electronic Frontier Foundation.
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He founded the Free Speech Movement Archives.
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He was given the Editor's Choice Award for Creative Excellence by EE Times magazine for all of his accomplishments.
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He was deemed the "Founding Sensei" of HackerDojo in California because of his amazing accomplishments.
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"For his influence on the technical and social environment of the early personal computing era." - Computer History Museum