Jeff and Sanjay wrote the original protocol buffer implementation. The project was taken over by Kenton Varda, who rewrote the C++ and Java parts; this is what was open sourced. See http://temporal.fateofio.org/files/resume
dgrogan and myself have been batching changes to LevelDB from our internal code repository to put them on the Google Code page. Playing Google Code site admin didn't seem to me like a good use of Jeff and Sanjay's time.