selected publications academic article Adhd as a Risk Factor for Early Onset and Heightened Adult Problem Severity of Illicit Substance Use: An Accelerated Gateway Model. Addictive Behaviors. 39:1755-1758. 2014-12-01 Perceived Barriers To Treatment in a Community-Based Sample of Illicit-Drug-Using African American Men and Women. Journal of Psychoactive Drugs. 46:444-449. 2014-10-01