Dermatopathology In Historical PerspectiveThe Man Behind the Eponym Jacob Henle—Henle's Layer of the Internal Root SheathSteffen, Charles M.D. Author Information Address correspondence to Charles Steffen, M.D., 1717 Avocado Road, Oceanside, CA 92054. The American Journal of Dermatopathology: December 2001 - Volume 23 - Issue 6 - p 549-551 Buy © 2001 Lippincott Williams & Wilkins, Inc.