David has been a computer industry consultant and author, a bicycle racer, a newsletter and magazine publisher and editor, a bicycle/motorcycle messenger, a freelance photographer, a software engineer, a musician, a video producer, an instrument-rated pilot (retired for the present), a dragon, and a daddy.
He still do many of the above, often simultaneously (but not all simultaneously). He is sometimes serious but always intense. David also taught and developed the first microcomputer class at the New School for Social Research, started the Unix newsletter Unique, was the founding editor of Unix Review magazine, co-authored a best-selling book on Unix System Administration, and was the first person to fly a quad-lined soft stunt kite at the lowest spot on Earth.
He has been a director and member of AirLifeLine, which flies medical mercy missions for people with special medical and economic needs. David is also a proud alumnus of the Bronx High School of Science as are many of his old friends.