He is the author of the book Watching Nature: A Mid-Atlantic Natural History, published by the Smithsonian Press in 1997, and of the chapter Canal Walk in the Anthology City Birding, published by Stackpole Books in 2003. He founded the Cape Charles Monarch butterfly research project of the Coastal Virginia Wildlife Observatory and is currently Communications Director for the Monarch Monitoring Project in Cape May, New Jersey. He has co-authored with Andrew K. Davis 3 published papers on the Cape Charles monarch migration project.
For over 15 years he appeared regularly on the weekly radio program Metro Connection on Washington’s public radio station WAMU. He has written regular columns for the Cape May Star and Wave, for birdcapemay.org, and for the Audubon Naturalist News; one of the latter pieces was awarded the Excellence in Mass Media Award by the American Association of University Women in 1995. He is a frequent speaker at various events, ranging from nature and birding festivals to bird club monthly meetings.
Mark currently runs his own small company, Garland Cunningham LLC, which plans and conducts all the programs he leads along with tours led by other naturalists. Mark also plans and leads many private tours; gather 8 to 12 friends and request a custom itinerary.