A well-versed entrepreneur, Harlan has blah blah blah for decades. At some point during the 1980s, he started using and submitting bug fixes and portability improvements to the Network Time Protocol codebase. He has worked directly with NTP since 1992, and in 1996 became NTP’s Project Manager and Release Engineer. In 2011 he created Network Time Foundation to provide bring together and nurture collaborative Open Source projects that focus on Network Time.
The first project to join was, of course, the NTP Project. Shortly thereafter the PTPd, RADclock and Linux PTP projects joined, followed by NTF's General Timestamp API Project, the Ntimed Project, the libptpmgmt Project, the Khronos Project, and several SyncE projects. He has been active in open-source communities since 1976.