New York City
Alberto Acosta, M.D., and Rebecca Acosta, R.N.
Traveler's Medical Service
This is a highly respected clinic; Rebecca is the daughter of Marty Wolfe (see District of Columbia), so travel medicine is in her genes (212-230-1020; travelersmedical.com).

Bradley Connor, M.D.
Travel Health Services
The travel clinic was established more than 20 years ago. Connor has a high-profile A-list clientele and is in demand to accompany special clients abroad; he's also past president of the ISTM, a textbook co-editor, and a leading gastroenterologist (212-734-3000; travelhealth.net).

Karl Neumann, M.D.
Family Travel Clinic of Forest Hills
One of the first in the business, Neumann is also a highly respected pediatrician (718-263-2072; no Web site).

TEXAS, Houston
Herbert DuPont, M.D.
Baylor Travel Medicine
The leading expert in the United States on travelers' diarrhea; editor, author, and past president of the ISTM (713-798-7700; bcm.edu/familymed).

Charles Ericsson, M.D.
University of Texas Travel Medicine Clinic
Close colleague of Herbert DuPont's (see above), highly regarded past editor of the Journal of Travel Medicine (713-572-8122; no Web site).

WASHINGTON, Seattle
Russell McMullen, M.D.
University of Washington Medical Center
Co-author of the Travel and Tropical Medicine Handbook, McMullen is an associate professor of medicine at the University of Washington Medical Center (206-598-6205; depts.washington.edu/travmed).

WYOMING, Jackson
David Shlim, M.D.
Jackson Hole Travel and Tropical Medicine
A much-admired specialist, he has immense practical experience, having looked after trekkers and other travelers in Nepal (307-733-4627; no Web site).