For more than a quarter-century, Dennis L. Mammana has shared the wonder and mystery of the cosmos with millions of people around the world. With a B.A. in physics from Otterbein College and an M.S. in astronomy from Vanderbilt University, Mammana has held positions at the Smithsonian's National Air & Space Museum and the University of Arizona.

Since 1987, he served as resident astronomer for San Diego's Reuben H. Fleet Science Center. He is the author of six books on astronomy, hundreds of popular magazine and encyclopedia articles and, since 1992, has written Stargazers, presently the only nationally syndicated weekly newspaper column on astronomy. As an accomplished sky photographer, his award-winning images have appeared in local, regional, national and international articles, books, newspapers and television.

His photography captures the motion, majesty and mystery of the cosmos and can be enjoyed online at his Web site www.skyscapes.com. Since 1978, Mammana has served as astronomical lecturer and technical adviser on many public comet, meteor shower, aurora borealis and solar eclipse observing expeditions around the world.

A dynamic public speaker, Mammana has entertained and informed audiences on six continents at resorts, on cruise ships and as an after-dinner speaker. He makes frequent appearances on both radio and television.