John Young is director of comparative medicine at Los Angeles Cedars-Sinai Medical Center and chairman of Americans for Medical Progress, a pro-animal testing group.

Frankie Trull is founder and president of the Foundation for Biomedical Research, an organization that promotes the responsible use of animal testing in scientific labs.

Michelle Thew is chief executive of the British Union for the Abolition of Vivisection and has worked on a number of campaigns regarding the use of animals for research and testing, including successful work on a European Union-wide cosmetics testing ban.

Betsy Nessen Merrill is director of development and communications for AltWeb, the Alternatives to Animal Testing website, a project of the Johns Hopkins Center for Alternatives to Animal Testing in Baltimore.

Dr. Michael Greger is a physician and director of public health and animal agriculture in the farm animal welfare division of the Humane Society of the United States. He is an expert on the public-health implications of using antibiotics and growth hormones in livestock and other food-safety issues.

Alan Goldberg is a professor of environmental health sciences and director of the Johns Hopkins Center for Alternatives to Animal Testing. The center works with scientists to find new methods to replace laboratory animals in experiments, reduce the number of animals tested and refine necessary tests to eliminate pain and distress. It is based in Baltimore.

Dr. Larry Carbone is a veterinarian at the University of California, San Francisco. He is the author of What Animals Want: Expertise and Advocacy in Laboratory Animal Welfare Policy.

Theodora Capaldo is president/executive director of the New England Anti-Vivisection Society, which spearheads Project R&R: Release and Restitution for Chimpanzees in U.S. Laboratories. Capaldo is a licensed psychologist, a trustee of the American Fund for Alternatives to Animal Research and past president of Psychologists for the Ethical Treatment of Animals.

Jacquie Calnan is president of Americans for Medical Progress, a nonprofit group that views the use of animals in medical research as vital and opposes what it calls “animal rights extremism.”