Philip Greenspun (born September 28, 1963) is an American computer scientist, educator, early Internet entrepreneur, and pilot who was a pioneer in developing online communities like photo.net.

After working for HP Labs in Palo Alto and Symbolics, he became a founder of ICAD, Inc. Greenspun returned to MIT to study electrical engineering and computer science, eventually receiving a Ph.D.

[2] In 1995, Greenspun was hired to lead development of Hearst Corporation's Internet services, which included early e-commerce sites.

[4] Greenspun founded the open-source software company ArsDigita and, as CEO, grew it to about $20 million in revenue before taking a venture capital investment.

Greenspun was employed as a commercial pilot for Delta Air Lines subsidiary Comair from 2008 until it ceased operation in 2012.

Greenspun is listed as an instructor at the East Coast Aero Club[19] and was interviewed by NPR regarding the success of a Groupon helicopter lesson offer.

[32] Avni Khatri, President of  Kids on Computers in 2012 credits her time at ArsDigita as where she learned the value of FOSS and how it can help bridge and connect virtual and real-world communities.