The speaker is Mike Viney. Mike is a Teacher in Residence at Colorado State University and a long-time collector and researcher into petrified wood. The title of his talk is "The Blue Forest of Ancient Lake Gosiute: Sweetwater County, Wyoming". The Blue Forest is a famous source of petrified wood known for its blue chalcedony. Lake Gosiute was one of the lakes in the Green River region during the Eocene.
Here's a link to Mike’s web page called "The Virtual Petrified Wood Museum" http://petrifiedwoodmuseum.org/
The Digging Science Youtube channel has a great video of collecting petrified wood in the Blue Forest in Wyoming.