Terry Devitt
editor
Yael Gen
designer
Joe Kallenberger
design intern
Darrell Schulte
webmaster
David Tenenbaum
feature writer
Amy Toburen
content development advisor
Susan Trebach
team leader
Interview subjects
* David Kritchevsky, professor of biochemistry, Wistar Institute, Philadelphia, and University of Pennsylvania.
William Orr, professor of biology, Southern Methodist University, Dallas.
* George Roth, acting chief of the laboratory of cellular and molecular biology, National Institute of Aging.
* denotes factchecker
