Marcus Geduld works as a freelance (programmer and designer. He also teaches programming, design, animation, compositing and video editing at Future Media Concepts. He is the author of Premiere Pro Editing Workshop and After Effects Expressions and is the co-author of After Effects On the Spot. Marcus regularly speaks about technical and artistic topics at conferences around the country, including NAB and Macworld. He is an Adobe Certified Expert, a Macromedia Certified Developer, and an Avid Certified Instructor.