Submitted for Publication: April 10, 2012; accepted May 7, 2012.
Conflict of Interest Disclosures: None reported.
Additional Contributions: Daniel M. Albert, MD, László Z. Bito, PhD, Lucinda J. Camras, Thomas F. Clauss Jr, Gary N. Holland, MD, Ted W. Reid, PhD, and Marvin L. Sears, MD, shared their knowledge of Carl and his work with me during the preparation of this article. Carol B. Toris, PhD, proofread the manuscript. My heartfelt thanks goes to Carl's colleagues and students, who meant so much to him and who have generously conveyed how much he meant to them.