Comment by singingfish

Matt taught me everything I know about how to make commercial programming creative, engaging, artistic/craftsman type activity, aligned with my desire to keep everything open source to the maximum extent practical.

Another former colleague who is way more talented than I am emailed me privately to express a similar sentiment.

You'll find Matt's indirect influence in things like SQLAlchemy, and chunks of the enduring parts of the javascript ecosystem as well. He was known in the perl community, but his unparalleled thinking skills have a much wider indirect influence