Hallmark joined the Rutgers faculty in 2002 and served as Chair of the Music Department till 2005. He has previously taught at Brown, M.I.T., College of the Holy Cross, and, from 1982-2002, at Queens College, City University of New York, where he twice served as Director of The Aaron Copland School of Music (1984-1989, 1998-2001).
Hallmark was educated at Davidson College (B.A., 1965), Boston University (M.A. Musicology, 1967, where he studied with Janet Knapp and Joel Sheveloff), and Princeton University (Ph.D., Musicology, 1974, where he studied with J. Merrill Knapp, Kenneth Levy, Lewis Lockwood, and Arthur Mendel, and with guest faculty Karl Dahlhaus, Frank Ll. Harrison, and Ernst Oster).
Hallmark wrote his dissertation The Genesis of Schumann's Dichterliebe on the sketches for Robert Schumann’s song cycle, and has published articles on the songs of Schumann and Schubert in journals, conference reports, and books. His study of the rhetorical figure apostrophe in Schubert's Winterreise will appear in 19th-Century Music in 2011. He is responsible for the critical edition of Schumann's song cycles Dichterliebe and Frauenliebe und Leben for the new complete works of Schumann, and is completing a book on the latter cycle for Cambridge Music Handbooks. During the Schumann bicentennial year (2010) Hallmark presented papers at international conferences in Zwickau and Leipzig and contributed to a panel discussion of" Schumann at 200: New Paths" at the 2010 annual meeting of the American Musicological Society
He is the editor of German Lieder in the Nineteenth Century (1996; rev. 2009), to which he also contributed the chapter on Schumann’s songs (“Robert Schumann: The Poet Sings”). He publishe an essay on "The Songs of Travel of Robert Louis Stevenson and Ralph Vaughan Williams" in a volume of Vaughan Williams studies (Ashgate Press, 2003).
(For complete bibliography, see curriculum vitae.)
Hallmark is also a singer (tenor); he has sung Jaquino (Fidelio), Tamino (Magic Flute) and Pedrillo (Abduction), the Evangelist in the St. John Passion, Dichterliebe, Winterreise, and Britten’s Serenade, among other things. In Boston he soloed with The Boston Camerata for five seasons and sang as soloist and chorister in the choir of Emmanuel Music under Craig Smith. He created the role of the Priest in Joel Mandelbaum’s opera The Village (Queens College, 1995).
He is the advising editor of Recent Researches in the Music of the Nineteenth and Early Twentieth Centuries (A-R Editions).
Hallmark served as the Secretary of the American Musicological Society (2001-2007). Earlier he served as Co-Chair (with Anne Hallmark) of the Program Committee for the national meeting (Minneapolis, 1978), Chair of the Local Arrangements Committee for the national meeting (New York, 1995), and was elected to the Board of Directors (1997-98). He had previously served as the Chair of the New England Chapter of the Society in the 1970s.