He then earned a teacher certification in social science education from Metropolitan State College Denver in 1999 and a master's degree from the George Washington University in 2003.
[5] Hartman began his academic career as a Teacher of History and Social Sciences at Thornton High School in the Denver area in 1999 and was appointed as a Graduate Teaching Assistant at George Washington University in 2002.
He has authored book chapters, monographs, and several peer-reviewed articles[10] He is the recipient of Fulbright award to conduct research at the British Library.
His objects of study are not unfamiliar to historians of the period, but Hartman’s narrative changes the direction of past scholarship.
[15] Thomas Fiala and Deborah Duncan-Owens praised the book in their review, stating that Hartman "takes on the daunting task of unpacking the complex milieu of social, political, and economic factors influencing education during this period.
"[16] In Hartman's early research, he investigated various factors that influenced the development of federal social policies for children and suggested its outcomes in the near future.
[19] Furthermore, he discussed the study of whiteness in the United States, highlighting its increasing importance in academic disciplines, as well as the critique that researchers examining this area have encountered.