[4] Horsfield and Blumenthal began a project that included the making of in-depth video interviews with visual and performance artists, critics, and photographers.
The first interview was with art historian and curator Marcia Tucker at Artemisia Gallery in Chicago in 1974.
[5] Together they also produced more than 90 interviews with artists such as Agnes Martin, Alice Neel, Lee Krasner, Romare Bearden, Joseph Beuys, Vito Acconci and Buckminster Fuller.
[6] As an educator Horsfield periodically taught courses between the years of 1977 to 2007 at the School of the Art Institute of Chicago, the University of Illinois at Chicago, and the University of Texas at Austin.
After the death of Lyn Blumenthal in 1988, Horsfield was executive director of the Video Data Bank until September 2006.