Jan Wieck is a former member of the PostgreSQL core team.
He designed and implemented Slony, overhauled the query rewrite rule system, wrote the procedural languages PL/pgSQL and PL/Tcl, added foreign keys, bgwriter, the statistics collector, the TOAST system and other features.
Jan Wieck presents 3 Events:
Understanding PostgreSQL IO at PostgresConf US 2018
OpenSCG Workshop: Hands on Oracle to PostgreSQL Migration at PGConf US 2017 [PgConf.US]
Peeking into the Black Hole called PL/pgSQL - The new PL Profiler at PGConf US 2017 [PgConf.US]