He also became ABC News Science Correspondent in May, 1990, appearing regularly on "Nightline."

In the past year, Dr. Guillen broke several high-profile new stories. He originated the idea of doing a scientific recount of the Million Man March; his exclusive reports made international news and led to sweeping changes in the U.S. Park Service's counting techniques. He broke the story of the CIA's use of psychic spies. He reported on a possible new energy source called the Patterson Cell, sat down for a rare one-on-one interview with Hillary Clinton on the greening of the White House, and hitched a ride with a real-life tornado-chasing couple. He reported on the surprising science behind such topics as love, aging and laughter. His ongoing features include "Invention Mention," which turns a spotlight on American ingenuity; "Hard to Believe," which turns a spotlight on American ingenuity; "Hard to Believe," which critiques the latest gadgets; and the over-the-top-popular "Ask Michael Guillen," which lets viewers appear on "GMA" to ask that question they've always wondered about.

In recent years, Dr. Guillen was the first correspondent in television history to broadcast live to the United States from Antarctica, reporting on the infamous ozone hole above the South Pole. He has also reported from the North Pole (making him one of the few people in the world who have visited both poles). He was the first television correspondent to cross under the English Channel through the just-completed Chunnel, as well as the first broadcast journalist to be allowed inside Arizona's controversial Biosphere-2 (immediately following the emergence of its eight-person crew), and first to dive beneath the surface of Scotland's Loch Ness in a mini-submarine, in search of the legendary monster.

Dr. Guillen has traveled around the world for ABC-TV. He has gone "Down Under," filing reports on the rare geysers and mud flats of New Zealand and on the desperate efforts to protect Australia's Great Barrier Reef, the world's largest living organism. He has also traveled to Israel's Qumran caves, to trace the origins of the Dead Sea Scrolls, and to Costa Rica's Monteverde Cloud Forest, a unique tropical forest threatened by the area's development.

Dr. Guillen has covered some of the world's biggest man-made and natural disasters, including Kuwait's horrific oil fires, the destruction of the Kuwait Institute of Scientific Research and the record oil spill in Saudi Arabia. He traveled against the flow of humanity into the Philippines and Japan to report first hand on the historic eruptions of Mt. Pinatubo and Mt. Unzen. He also journeyed to the very epicenters of San Francisco's historic Loma Prieta quake and Southern California's Yucca Valley quake, the largest in 40 years.

You can get Five Equations That Changed the World at a discount!

As a physicist, Dr. Guillen is a leader in this nation's campaign to eliminate science and math illiteracy, having been (among many other things) a member of the National Academy of Sciences' Committee on Research in Mathematics, Science and Technology Education. He is the founder of the National Association of Science Broadcasters, whose international membership represents radio, TV, film and interactive video. This year he made his debut in cyberspace as " Dr. Universe," interacting with children as part of America Online and ABC-TV's hot, new, award-winning kids magazine, "Kidzine."

His current book, "Five Equations That Changed The World," which was published last September by Heparin, was selected as one of the best books of 1995 by Publisher's Weekly (only 21 non-fiction books were selected). Over the years, his critically acclaimed articles have been published in major newspapers and magazines worldwide. His best-selling book, "Bridges to Infinity: The Human Side of Mathematics" (1984), has been translated into German, Japanese, Portuguese and French.

Dr. Guillen has appeared in the following highly-rated shows and specials: "The Oprah Winfrey Show" (1996); "The Late, Late Show with Tom Snyder" (1995); "Prejudice: Answering Children's Questions" (1992) for ABC News; "War in the Gulf: Answering Children's Questions" (1991) for ABC News, which won an Alfred I. duPont-Columbia University Award, and "Sea World Mother Earth Celebration" (1991) for ABC-TV.

As a journalist, his work has been honored with numerous awards including Emmys, a Dupont, three Ohio State Awards, two Teddys and an EMMA. As a scientist and educator, Dr. Guillen's honors include Cornell's Clark Award for Distinguished Teaching and Harvard's Danforth Award for Distinguished Teaching. He is listed in "Who's Who in America" and is on the advisory board of, and is listed in, "Who's Who in Science and Engineering."

Born and raised in Los Angeles, Dr. Guillen received his Bachelor of Science degree from UCLA. He received his Master of Science and Ph.D. degree in physics, mathematics and astronomy from Cornell University.

Dr. Guillen is married and resides near Boston, Massachusetts.

Need to write? Here's where to send mail to Dr. Michael Guillen.