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John McKenzie: Biography and Images

John McKenzie is medical science correspondent for ABC News based in New York.

McKenzie has covered many of the controversies in medicine, from stem cell research to screening for breast and prostate cancer. His reports on cutting-edge technology have included an implantable microchip to monitor the heart and efforts to grow human body parts in the laboratory. He has highlighted the threat of avian flu, the risks of clinical trials, and common pathology errors in diagnosing cancer.

Dr. Timothy Johnson is the current medical editor/contributor for ABC News. He provides on-air medical ABC’s World News Tonight, Nightline and 20/20. He also appears on Good Morning America. Johnson is on the faculty of Harvard Medical School and on the staff of Massachusetts General…

Steve Osunsami is an correspondent for ABC News based in Atlanta. He contributes reports to “World News with Charles Gibson” and other ABC News broadcasts and platforms. Osunsami began his network career at ABC News in April 1997, as a correspondent for NewsOne, ABC’s affiliate…

Ron Claiborne is the news anchor for ABC News’ weekend edition of Good Morning America. Claiborne came to ABC News in 1986 and has been a general assignment correspondent based in Boston, reporting for World News Tonight, Nightline and Good Morning America.

Pierre Thomas covers the Justice Department for ABC News. He joined the network in November 2000 and reports for “World News with Charles Gibson,” “Good Morning America,” “Nightline” and other ABC News programs.

Nick Watt is a London-based correspondent for ABC News. His first story as a reporter was the U.S. Marines’ assault on Fallujah in November 2004, for which he won an Emmy. In December 2005, he covered the Asian tsunami from Sri Lanka, Banda Aceh and…

Ned Potter is the science correspondent for ABC News. An ABC News correspondent since July 1987, Mr. Potter came from CBS News, where he was a correspondent in the Chicago and Boston bureaus from 1980 to 1987. His assignments there included science and technology, labor…