Mark Doctor is a Senior Safety and Geometric Design Engineer for the Federal Highway Administration's Resource Center in Atlanta, GA. He began his career with the FHWA in 1988 and gained engineering experience through several positions in the FHWA Florida Division Office and former FHWA Region Office in Atlanta, GA where he was the Regional Traffic Management and ITS Engineer. From 1998 to 2005 he served in the FHWA Tennessee Division as the Field Operations Team Leader and also the Safety & ITS Team Leader. Mark has served in his current position with the FHWA Resource Center Safety and Design Team since 2005 where he provides technical services in the areas of geometric design, intersection safety, roundabouts, freeway interchange design, and context sensitive solutions. Mark is a registered Professional Engineer in the State of Georgia.