dˈɑːktɚ. ɹˈɪtʃmən kəndˈʌktᵻd ɹᵻsˈɜːtʃ ˌɔn ˌɪnfluːˈɛnzə vˈaɪɹəs, hˈɜːpɪsvˌaɪɹəsᵻz ænd hˌɛmɚɹˈædʒɪk fˈiːvɚ vˈaɪɹəsᵻz bᵻfˌoːɹ fˈoʊkəsɪŋ ˌɔn ˌeɪtʃˌaɪvˈiː ɪnðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi z.
Dr. Richman conducted research on influenza virus, herpesviruses and hemorrhagic fever viruses before focusing on HIV in the 1980s.