This talk explores the careers of two scientifically trained professionals who designed, developed, and popularized radical technological solutions to the limits imposed by Earth's finite resources; Gerard O'Neill and Eric Drexler.

Dr. Patrick McCray explores the ways in which O'Neill and Drexler's "visioneering" influenced diverse audiences as well as the dangers-oversimplification, misuse, and misunderstanding - that challenged their attempts to design the technological future.