It is with the most profound sadness that we must say goodbye to our dear colleague, Jon Erickson, who passed on while doing something that he truly he loved – exploring the outdoors, hiking a wild trail in Oregon on a brisk autumn day. He is survived by his wife Amari and his daughter Kyle and son Owen. Jon was a member of the Cerione laboratory almost from its inception at Cornell, as he and Rick worked closely together for more than 30 years. Jon was a tireless and energetic researcher, having been instrumental in many of the most important discoveries in the Cerione laboratory, from the discovery of Cdc42 to more recent work on the vision system. Jon was indefatigable in his pursuit of interesting, important science, and he served as mentor to a number of graduate and undergraduate students, all of whom have gone on to promising careers of their own. But more than that, Jon was a good friend. Few of us could ever have asked for better. He will be sorely missed.