On September 24, 2022, the GIScience community lost one of its founding members, Emeritus Professor David Mark, formerly a member of the Geography Department at SUNY Buffalo and NCGIA-Buffalo. I knew David very well, having had many discussions with him dating back to the time when I was at NCGIA-UMaine. David worked on topics relating to geographic cognition and language and his work in these two areas set the standard for what was to follow. He is very well known for his work on geographic ontologies, beginning with his collaboration with Prof. Barry Smith (Geographical Categories, Ontologies and Geographic Kinds, Do Mountains Exist?) and expanding to recent works in collaboration with partners at USGS on a landform reference ontology and a horizon ontology (we also sadly lost Dr. Lynn Usery a few months ago, a key USGS collaborator on these efforts). If you have never read Egenhofer and Mark's Naive Geography, I encourage you to take a look at it. The paper is still very interesting today. My thoughts are with all his close friends and colleagues at SUNY Buffalo and around the world as well as his family who along with me will miss him greatly.

-Kathleen Stewart, Professor and Director of CGIS