For more than four decades, Dennis Mammana has delivered the wonder and mystery of the cosmos to audiences around the world.With degrees in physics and astronomy from Otterbein College and Vanderbilt University, Mammana has held planetarium positions at the Strasenburgh Planetarium, the Smithsonian Institution's National Air & Space Museum, the University of Arizona, and San Diego's Reuben H. Fleet Science Center. His original planetarium shows have been enjoyed from New York to Calcutta to Brisbane and, in their production, he has worked with such luminaries as actors Burgess Meredith and Patrick Stewart, and science fiction icon Arthur C. Clarke. He now works as an astronomy writer, lecturer and photographer from under the clear, dark skies of Southern California's Anza-Borrego Desert.Mammana is the author of six books on popular astronomy, hundreds of popular magazine and encyclopedia articles and, since 1992, has written Stargazers―the only syndicated newspaper column about astronomy. August 2017 marked the 25th anniversary of this weekly column.As a noted and accomplished night sky photographer, his stunning celestial imagery has earned him a coveted invited membership in TWAN(The World at Night). He is one of only six representing the U.S. in this elite international team of the most highly-acclaimed and experienced night sky photographers on the planet. April 2018 marks the 50th anniversary of his first published photo.Since the mid-1980s, Mammana has led many public comet-, meteor shower-, aurora- and eclipse-observing expeditions on six continents and, since 1994, has been a popular astronomical and photographic lecturer on tours led by MWT Associates. A dynamic public speaker, Mammana has entertained, inspired and informed audiences at resorts, on cruise ships and as an after-dinner speaker, and has become a frequently invited guest on both radio and television. In addition to having hosted a weekly astronomy news segment on San Diego's KUSI-TV, and co-hosting "Quarks to Quasars" on UCSD-TV as well as the Emmy Award-winning documentary "San Diego Night Sky" with KPBS-TV, he has received the Robert Burnham Jr., Award for Exceptional Service in Astronomy from the Astronomical League, and the Special Achievement Award from Otterbein College. And in 2009 his astronomical contributions to the community of Borrego Springs (the only International Dark Sky Community of California) were honored as he was named the Grand Marshal of the 44th Annual Borrego Days Desert Festival. To learn more about him and his work―and to see his public lecture & tour schedule―please visit his website, "Like" and follow him on Facebook and on Twitter, and subscribe to his free e-newsletter StarTrails so you don't miss any of his upcoming events!