NTS regular Geologist has been hosting Geologist Presents: The O'Brien System since 30 May 2017. On 21 April 2017, Geologist was a guest on Play It As It Lathes w/ Zach Cowie. Geologist has been played on NTS in shows including Geologist Presents: The O'Brien System, featured first on 1 May 2018. Songs played include Stretching Songs For Spring and ZoomBloom.

Geologist (born Brian Ross Weitz on March 26, 1979) is a founding member of Animal Collective. He provides electronic sound manipulations and samples for the band. Geologist grew up in Philadelphia and Baltimore and currently lives in Washington DC.

The "Geologist" nickname comes from a…