Dr. Morrison received his Ph.D. in Astronomy from Harvard University and has spent most of his career working in planetary science. Prior to joining NASA he was Professor of Astronomy at the University of Hawaii, where he also directed the 3-meter NASA Infrared Telescope Facility of Mauna Kea Observatory and served for two years as University Vice Chancellor for Research. He has been an investigator on the Mariner 10, Voyager, CRAF, Galileo, and Kepler space missions. Internationally known for his research on the solar system, he is the author of more than 155 technical papers and has published a dozen books, including the leading undergraduate college text in planetary science.

Morrison is a Fellow of the American Association for the Advancement of Science and of the California Academy of Sciences. He is recipient of the Dryden Medal for research of the American Institute of Aeronautics and Astronautics, the Sagan Medal of the American Astronomical Society for public communication, and the Klumpke-Roberts award of the Astronomical Society of the Pacific for contributions to science education. Asteroid 2410 Morrison is named in his honor.[1][2]

David Morrison has been answering public questions at the NASA Astrobiology Institute in his Ask an Astrobiologist page for years. David has taken the time to address the 2012 rumors in detail.

Stories about the fictional planet Nibiru and predictions of doomsday in December 2012 have blossomed on the Internet. There are now (June 2009) more than 175 books listed on Amazon.com dealing with the 2012 doomsday. As this hoax spreads, many more disaster scenarios are being suggested. “Ask an Astrobiologist” has received nearly a thousand questions about Nibiru and 2012, with more than 200 answers posted. Many new questions are similar to those already answered.

Read the rest of David Morrison's opinion, and watch a short video of David talking about the 2012 rumors at Nibiru and Doomsday 2012: Questions and Answers

Video on Fora TV

David Morrison has a 59-Minute video hosted at Fora TV titled 'Surviving 2012 and Other Cosmic Disasters".

http://fora.tv/2010/04/24/David_Morrison_Surviving_2012_and_Other_Cosmic_Disasters

He also likes us! Here's his quote from the video:

There are other good websites, this is a recent one, it is actually probably the best, 2012 hoax, because it's all indexed, and you can go down under each person, idea, and click on it and get a one page description of what's going on, done by a bunch of astronomers.