Career
He currently resides in Slagelse, Denmark. Poul-Henning Kamp has been committing to the FreeBSD project for most of its duration. He is responsible for the widely used MD5crypt implementation of the MD5 password hash algorithm, a vast quantity of systems code including the FreeBSD GEOM storage layer, GBDE cryptographic storage transform, part of the UFS2 file system implementation, FreeBSD Jails, malloc library, and the NTP timecounters code.
He is the lead architect and developer for the open source Varnish cache project, an HTTP accelerator and Ntimed, an NTP daemon meant to replace ntpd.
His dispute with electronics manufacturer Doctorate-Link in which he claimed they were committing NTP vandalism by embedding the Intellectual Property address of his NTP servers in their routers was resolved on 27 April 2006. A post by Poul-Henning on the FreeBSD mailing lists is responsible for the popularization of the term bike shed discussion, and the derived term bikeshedding, to describe Parkinson"s law of triviality in open source projects - when the amount of discussion that a subject receives is inversely proportional to its importance.
Poul-Henning Kamp is known for his preference of a Beerware license to the GNU General Public License (GPL).