As of August 2017, Mountain continues to skate professionally and his sponsors include Flip, Nike SB, Indy, Spitfire, and Bones Bearings.

[10] As of October 2012, Mountain is sponsored by Flip, Independent Trucks, Spitfire, Nike SB (announced on May 7, 2007), and Stüssy clothing.

[14] In 2011, Mountain and his son contributed pieces to an art exhibition that celebrated the life of Joe Strummer, the former band member of The Clash who died in 2002.

[17] In July 2023, Mountain participated as a special guest artist in the Los Angeles art and music collective Surf Skate Roots Rock, reuniting with fellow skateboarding pioneers such as Tony Alva, Steve Olson, Lonnie Toft, etc.

[19] Mountain is often cited as one of the inventors of the fingerboard, as he fashioned the prototype out of cardboard, pencil erasers, and a disassembled Hot Wheels toy in the late 1970s.

Mountain's invention was featured in a Transworld Skateboarding magazine article, as well as the Powell Peralta video, Future Primitive.

The fingerboard was initially created as a fun do-it-yourself project, for which kitchen sinks were used to emulate pool riding, and has since evolved into a major toy category that has sold multiple millions of units (most prominently under the Tech Deck brand).