Since then, Robert Mealy has toured and recorded with numerous early music ensembles, including Sequentia (2), Ensemble P.A.N., The Newberry Consort, The Folger Consort, Les Arts Florissants, The Handel & Haydn Society Of Boston, New York Ensemble For Early Music, Clarion Music Society, and Artek - Early Music Ensemble In Nyc. He appeared on Late Show with David Letterman accompanying Renée Fleming.
In 2004, Mealy became a concertmaster of the Boston Early Music Festival orchestra, participating in performances and Grammy-nominated recordings of Jean-Baptiste Lully's Psyché and Thésée, Conradi's Ariadne, and the modern premiere of Johann Mattheson's Boris Godunov. He founded the instrumental ensemble Yale Collegium Players and collaborated with Simon Carrington and Yale Schola Cantorum to record Heinrich Ignaz Franz Biber, Antonio Bertali, Bach's Johannes Passion and Magnificats. Robert Mealy also served as an instrumental soloist and leader of Boston Camerata for over a decade.
Mealy held a joint position at Yale University School Of Music and Yale's Department of Music where he directed Yale Collegium Musicum and taught rhetoric and historically-informed performance. Robert was appointed an Adjunct Professor at Yale University in 2008. He also lectured and gave historical performance workshops at Columbia University, Brown University, Rutgers University, The Oberlin Conservatory Of Music, U.C. Berkeley, and other prominent US institutions. In 2009, Robert Mealy joined the new Historical Performance faculty at Juilliard.