At the wonderful memorial service for Craig Callen held at MSU shortly after his death in April, I had the honor, by reason of proximity, to appear in effect as the representative of nationwide, and even worldwide, community of scholars that has felt his death very deeply. I am grateful for the opportunity to perform this same function in print.
Friedman, Richard D. "Craig Callen: Tributes from the Evidence Community." Mich. St. L. Rev. 2011, no. 5 (2011): 1407-10.