Christopher McMahon is a master mariner of steam, motor, and sailing vessels. He sailed on merchant ships engaged in worldwide trade, primarily in the 1970s and 1980s. He is a graduate of the United States Merchant Marine Academy at Kings Point and served there as a professor, sailing master and deputy superintendent. He is also a rear admiral (upper half), U.S. Maritime Service and was appointed in this capacity as a senior executive (SES) in several positions at the U.S. Department of Transportation, Maritime Administration and Naval War College. He has graduate degrees from several colleges and is an ordained Unitarian Universalist minister.