For nearly five decades, Dennis Mammana has delivered the wonder and mystery of the cosmos to audiences around the world.With a degree in physics and astronomy from Otterbein College (now Otterbein University), he was one of only two astronomy graduate students admitted to Vanderbilt University in 1973. His research there included using the 24-inch (0.61-meter) telescope at the Arthur J. Dyer observatory to conduct a year-long photometric study of optical variability in the nuclei of three distant Seyfert Galaxies. After graduate school, Mammana was selected from a field of 55 applicants for a coveted internship at the world-famous Strasengurgh Planetarium, and has since held positions at the Smithsonian Institution's National Air & Space Museum, the University of Arizona, and San Diego's Reuben H. Fleet Science Center. His original planetarium programs have been enjoyed from New York to Calcutta to Brisbane, and in their production he has directed such luminaries as actors Burgess Meredith and Patrick Stewart, and has collaborated with 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―including the first-ever book about the search for extra-solar planetary systems―as well as hundreds of popular magazine and encyclopedia articles. Since 1992, he written Stargazers, the only syndicated newspaper column about astronomy, now in its 27th consecutive year.As a noted and accomplished night sky photographer, his stunning celestial imagery has earned him a 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 marked the 50th anniversary of his first published photo.A dynamic public speaker, Mammana has entertained, inspired and informed audiences at resorts, museums, corporate events and with cruise lines, including Sitmar, Radisson Seven Seas, Hurtigruten, Royal Caribbean, and more. In January 2019 he returns for his 23rd year as an invited enrichment lecturer with Crystal Cruises, the world’s most awarded luxury cruise line. Since the mid-1980s, Mammana has led many public aurora borealis-, comet- and total solar eclipse-observing expeditions on six continents and, since 1994, has been a popular astronomical and photographic lecturer on tours offered by MWT Associates. He has hosted a weekly astronomy news segment on San Diego's KUSI-TV, and co-hosted "Quarks to Quasars" on UCSD-TV as well as the Emmy Award-winning documentary "San Diego Night Sky" with KPBS-TV. He is the recipient of the Robert Burnham Jr., Award for Exceptional Service in Astronomy from the Astronomical League and the Special Achievement Award from Otterbein College. In 2009 his astronomical contributions to the community of Borrego Springs (the only International Dark Sky Community in California) were honored as he was named 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!