Feldman has worked with Captain Beefheart, Fear, Snakefinger, The Residents, Pere Ubu, Pixies, dEUS, Katell Keineg, Frank Black, The Polyphonic Spree, Tripping Daisy, Reid Paley, Charlotte Hatherley, Custard and PJ Harvey.
In the 1970s, Feldman studied at UCLA under Philip Springer, a pop songwriter and early pioneer of electronic music and synthesizers.
Feldman worked on the acclaimed trio of Beefheart albums in the late 1970s and early 1980s - Shiny Beast (Bat Chain Puller) (1978), Doc at the Radar Station (1980), and Ice Cream for Crow (1982).
In May 1984, Feldman collaborated with Steve LeGrand of the band Times Beach to compose and perform the score to Sam Shepard's The Tooth of Crime in an acclaimed production at the Berkeley Repertory Theatre.
After working with The Residents' Snakefinger, in 1988 Feldman was drafted in to replace departing Pere Ubu keyboard player Allen Ravenstine.
Through the 1990s Feldman continued to tour on and off with Frank Black and the Catholics and joined the band in the studio to make Dog in the Sand, Black Letter Days, Devil's Workshop, and Show Me Your Tears, as well producing the unreleased album Sunday Sunny Mill Valley Groove Day.
On April 25, 2008, Feldman performed live with Black Francis at the San Francisco International Film Festival at the Castro Theatre.
[5] In 2002, Feldman was invited to replace founding member and keyboardist Hardy Fox on The Residents' Demons Dance Alone tour, to which he accepted.
[6] Following the tour, Feldman was not invited back to play with the group, due to it being more cost-efficient to keep Fox as the on stage keyboardist.
[3] Feldman has performed on The Residents' Shadowland (2015 - 2016), In Between Dreams (2017 - 2019), God In Three Persons (2019 - 2020), and Faceless Forever (2023) live shows, and has produced three albums by the group, The Ghost of Hope (2017), Intruders (2018) and Metal Meat & Bone (2020) Mike Barnes, "The Sideman's Saga", The Wire, December 1996 The Magic Band (2003–2017)