Paul Gordon Barker (born February 8, 1959), also referred to as Hermes Pan, is an American musician, best known as the former bass guitarist, producer and engineer for industrial metal band Ministry from 1986 to 2003.

Although many musicians briefly contributed to Ministry in the nearly two-decade period after Barker joined the band, he and Jourgensen were the only continuous members.

"[5] In 2018, Jourgensen reconciled with Barker after they both made appearances at screenings for the documentary Industrial Accident: The Story of Wax Trax!

[6] In March 2024, it was announced that Barker would reunite with Jourgensen to write, perform, and produce what is quite possibly the final Ministry album.

In Spring of 2023 Barker released another full length album The Eternal Present, followed by a North America tour with Skinny Puppy.

Since 2003, Barker has spent his time recording new material, producing such acts as I Love You But I've Chosen Darkness and collaborating with artists such as Stayte (on their 2007 Cognitive Dissonance (The Art of Lying To Yourself) EP).

This album features guests such as Chris Connelly, Ogre, Taylor Momsen, Puscifer, Deadly Apples, Alexis Marshall, Joshua Bradford, and Devix Szell.

[12] Barker is also one of the founders of Malekko Heavy Industry Corporation, a manufacturer of synthesizer modules and guitar effect pedals.