In 1986 he joined doom metal band Saint Vitus, where he performed on four studio albums, including their most iconic effort Born Too Late.

His early influences were the Monkees and the Beatles (the latter inspired him to play guitar),[6] and later Frank Zappa, Jimi Hendrix and Black Sabbath.

During this time, he also briefly played bass anonymously for the Mentors[9] and filled in on vocals for Los Angeles hard rock band Lost Breed.

This incarnation of the Obsessed released some 7"s and two more albums, Lunar Womb (1991) and The Church Within (1994) (the latter was picked up by Columbia Records), before calling it quits in 1994.

They also released a documentary video that year, featuring several musicians of the punk and metal scenes such as Henry Rollins, Ian MacKaye, Phil Anselmo, Pepper Keenan, Jennifer Finch, Dale Crover and Lee Dorrian.

Spirit Caravan put out two albums, Jug Fulla Sun (1999) and Elusive Truth (2001), and the Dreamwheel EP (1999), before disbanding in 2002.

The Hidden Hand released a 7", three studio albums, one DVD/CDEP, and a split 12" with Wooly Mammoth before Weinrich disbanded the group in August 2007.

Weinrich was a member of a project called Shrinebuilder featuring Al Cisneros (Om and Sleep), Scott Kelly of Neurosis, and Dale Crover (Melvins and Altamont), and recorded an album of solo material titled Punctuated Equilibrium featuring Jean-Paul Gaster of Clutch (drums) and Jon Blank of Rezin (bass guitar), which was released in January 2009 on Southern Lord Records.

[11][12] Weinrich contributed vocals and guitars on the track "The Emerald Law" for Dave Grohl's project Probot.