Tony Decaneas, who founded the Panopticon Lab and Panopticon Gallery in Boston, was also the exclusive agent for the Bradford Washburn estate, and the North/South America agent for Vittorio Sella. I remember seeing Brad Washburn's work as part of shows at the Panopticon Gallery, and Brad himself at photography-related events around Boston during his later years.

https://decaneasarchive.com/about/