Chapman began working with This Land Press and its founding editor, Michael Paul Mason in April 2010. His first project entailed the research for an issue of its namesake magazine, This Land, devoted to The White Dove Review, a poetry journal founded by Tulsa poet Ron Padgett.[4]
As a contributing editor of This Land, Chapman published The Nightmare of Dreamland: Tate Brady and the Battle for Greenwood in 2011, revealing Tulsa founder W. Tate Brady's affiliation with the Ku Klux Klan and role in the 1921 Tulsa Race Massacre.[5] The article prompted the Tulsa City Council's 2013 decision to rename Brady Street, as well as the Brady Arts District's decision to rebrand as the Tulsa Arts District.[1] On the District he wrote:
Today, the Brady Arts District is the focal point of multi-million dollar developments involving local organizations such as the George Kaiser Family Foundation, the Oklahoma Museum of Music and Popular Culture, the University of Tulsa, Gilcrease Museum, Philbrook Museum, and the Arts and Humanities Council of Tulsa. Local businesses also thrive in the district: numerous bars and restaurants, the family-owned Cain's Ballroom (which once served as Brady's garage), and the Tulsa Violin Shop, to name a few. A large
new ballpark separates the Brady district and the Greenwood area.[6]
In 2013, Chapman and Mason wrote the article "Subterranean Psychonaut", about Gordon Todd Skinner, a government operative and a central figure in the world's largest LSD bust, which would be Chapman's last contribution to This Land.[7]
Chapman began assembling what would later become the Center for Public Secrets (CfPS) in the late 1990s,[2] formally launching it in 2008 as a repository for "hidden, neglected and misunderstood" Oklahoma history.[5] CfPS curates exhibitions, podcasts and a digital library of artifacts; items Chapman located now reside in institutions such as the Smithsonian's National Museum of African American History and Culture and Yale University.[5]
Beyond archival work, Chapman produced documentaries and guerrilla art installations. He also appeared in public forums.[8] Chapman was involved in the antiquarian book trade and managed Oak Tree Books in Tulsa. After his death, the bookstore closed in 2016, but it was reopened in 2024.[9][10]