Trained Harriet Tubman Underground Railroad tour guide. Family reunions, small groups, individuals, motorcoaches. Custom tours, tour packages, receptive and step-on guide services available. (Tony) Cohen has been her longtime collaborator in the field. Cohen, an author, scholar and explorer of the American past, rose to prominence in 1996 as the “walking historian” after hiking 800 miles by foot, from Maryland to Canada, on a route of the Underground Railroad.