Sumi von Dassow attended the University of Washington, Seattle, Washington, 1982-1984 and San Francisco State University, San Francisco, CA 1985-1987. She graduated Summa Cum Laude with a degree in Art with an emphasis in Ceramics.
Sumi was Director of the pottery program at the Washington Heights Art Center of the Lakewood Heritage, Culture and Arts Program of the City of Lakewood in Lakewood, Colorado for 22 years. She taught pottery at all levels, including hand-building, wheel-throwing, glaze mixing and formulating, and pit-firing workshops. She mixed glazes and loaded and fired kilns. She built the mini wood kiln there and developed many of the glazes teachers and students use.
In 2021, Sumi moved to Beulah, Colorado and opened Beulah Valley Pottery at 8868 Grand Ave., Beulah 81023.
Sumi has been a frequent contributor to Pottery Making Illustrated Magazine since its inception in 1997. She has participated in the Denver Potters Association and Castle Clay shows each year since 1998. Sumi conducted annual pit firings for the City of Breckenridge from 2001 through 2015 and helped design and test the pit in the Breckenridge Arts District.