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Mark Spencer (born April 8, 1977) is a computer engineer and is the original author of the GTK+-based instant messaging client Gaim, the L2TP daemon l2tpd and the Cheops Network User Interface. more...

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Mark Spencer is also the creator of Asterisk, a Linux-based open-sourced PBX in software. He is the founder and CEO of Digium, an open-source telecommunications supplier most notable for its development and sponsorship of Asterisk.

While attending Auburn University, Mark co-oped at Adtran when he wrote l2tpd. He went on to start a Linux technical support business. Mark did not have enough money to buy a PBX (private branch exchange) for his company so he decided to write Asterisk and later founded Digium.

Read more at Wikipedia.org