His simple, wheel-thrown functional pottery is heavily influenced by the aesthetic of Shoji Hamada and Korean ceramics.
Nancy was a textile artist who used found objects from nature and recycle bins.
Warren continued to live in the home they shared outside Stillwater, Minnesota, where he maintained his studio until his death.
Due to theft and customers selling his work for profit online, MacKenzie closed his showroom, opting instead to sell his pots through the Northern Clay Center in Minneapolis, Minnesota,[3] Trax Gallery in California, Lacoste Gallery in Massachusetts, and the Schaller Gallery in Michigan, as well as exhibitions around the country.
The Schaller Gallery still houses a large portion of Warren's works that can be viewed and sold upon request.