Heather Hadlock studies 18th- and 19th-century French and Italian opera, with a focus on changing norms for representing masculinity in opera on nineteenth century stages and in contemporary productions of classic operas. Her research repertoire encompasses Italian bel canto opera, Berlioz, Offenbach, operatic masculinities, opera in the age of its digital mediation, and divas and technology. She approaches operatic voices and performance through feminist theories of difference, vocality, and embodiment; gender and sexuality studies; and dynamics of adaptation between opera, literature, and video. She has directed Stanford's interdisciplinary Program in Feminist, Gender, and Sexuality Studies, and served on the Phiip Brett Award committee and board of the AMS LGBTQ Study Group. She serves on the editorial board of the journal Nineteenth-Century Music.