Dan started out in comics in the late 1990s working part-time writing and illustrating his creator owned series Savage Planet and Harpy while also employed as a research scientist at Johns Hopkins Medical Center in Baltimore. In 2002, he began working steadily for Dark Horse Comics penciling and primarily inking titles such as Star Wars: Republic, King Kong and Star Wars: Jedi.
In the early 2000's Dan also worked on a number of projects for Topps, contributing penciled, inked and painted illustrations for various Star Wars, Indiana Jones, Lord of the Rings and other trading cards sets.
More recently, Dan has been part of the creative team that introduced the acclaimed Star Wars
Legacy series and has been a regular inker on Knights of the Old Republic, Clone Wars and many other Star Wars titles for Dark Horse. Dan is currently inking the new Star Wars: Dawn of the Jedi mini-series and the new best-selling ongoing series Star Wars 2013 for Dark Horse, Dan has also just finished penciling a new Indy comic book series called Empire of the Wolf for Alterna Comics and completed drawings for HBO's Game of Thrones TV show.