Dr Henry Michael Reiswig (8 July 1936–4 July 2020) of Saanichton, British Columbia, Canada A henry at work examining a dictyonal glass sponge. Image provided by Heidi Gartner, Invertebrate Collection Manager and Researcher at the Royal British Columbia Museum, with permission B henry and Dr Manuel Maldonado, Sponge Ecobiology and Biotechnology Group, Department of Marine Ecology, Centro de Estudios Avanzados de Blanes (CEAB), onboard the Canadian Coast Guard Ship Vector in the Strait of Georgia, Vancouver, using the ROV Ropos to work on the hexactinellid reef (October 2007) C Henry with Dr Kim Conway, the geologist who discovered the Canadian hexactinellid reef, ibid; D Henry demonstrating sponge taxonomy techniques in a workshop at the 10th World Sponge Conference, Galway, 25–30 June 2017. Images reproduced with permission.