He has used CCD cameras since starting out in astrophotography and specializes in images of deep sky objects with very long exposure times. His photographs are regularly published in astronomy magazines, including Sky & Telescope and on the Astronomy Picture of the Day website. In September 2005, Astronomy Magazine cited a mosaic of the Andromeda Galaxy (M31) as one of "the most beautiful astronomical images of the past thirty years."
The image also appears in the Guinness Book of Records in 2008, under the largest image (in number of pixels) of a spiral galaxy ever. In 2007, one of his photographs of IC 405, the Flaming Star Nebula, was included in one of six Royal Mail commemorative stamps, commemorating the 50th anniversary of The Sky at Night. In 2011 his image of the Pleiades appeared in a German Postal series "For the Youth". In 2007 he was awarded the "Hubble Prize" at the annual Advanced Imaging Conference in San Jose California. Also in 2007 he was featured in Timothy Ferris's PBS documentary "Seeing in the Dark". The Santa Barbara Instrument Group (SBIG) awarded him its Award of Excellence for astronomical imaging.
He has published four books A Year in the Life of the Universe: A Seasonal Guide to Viewing the Cosmos (Voyageur Press 2006), Capturing the Stars: Astrophotography by the Masters (Voyageur Press 2009),"Treasures of the Southern Sky" (Springer 2011), and "Lessons from the Masters: Current Concepts in Astronomical Image Processing" (Springer 2013).
This biography of a living person needs additional citations for verification. The reason given is: many un-sourced bits of info. (May 2010) (Learn how and when to remove this template message)