While a resident at Scott & White of the Texas A&M University Health System, Dr. Greenberg's interest in drug reactions and alternative treatments to skin cancers blossomed. A series of patients with severe clinical reactions to imiquimod, but wonderful outcomes was recognized by Dr.'s Greenberg, Cohen, Orengo & Rosen. An article was written about these patients- and a presentation based on these patients earned Dr. Greenberg an award at the Texas Dermatological Society meeting of May 2006.

Greenberg HL, Cohen JL, Orengo I, Rosen T. Severe reaction to 5% imiquimod cream with excellent clinical and cosmetic outcomes, Journal of Drugs in Dermatology Vol 6, Issue 4; April, 2007 pgs 452-458.