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… Read more
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… Read more