Hallman is composer-in-residence at the Rosenbach Museum & Library of Philadelphia and the Pikes Falls Chamber Music Festival.
[2] He has worked closely with poet Jessica Hornik, and his settings of three of her poems is included in the album "Sprung Rhythm" by the Washington DC ensemble Inscape, which was nominated for the 2014 Grammy award.
Lea called his collaboration with Hallman, which was sponsored by the Vermont College of Fine Arts, “a high point of my term as poet laureate.
Even the use of whispers, shouts and other noises did not seem like a cheap effect but part of a musical whole, a complement to the composer’s skillful handling of each instrument," wrote Downey in a separate review.
[11] of his "Three Hornik Poems" the critic Steve Smith stated in the New York Times [that it is] "a buoyant song cycle by Mr. Hallman that simply must be heard".
[12] Ronni Reich of the Washington post wrote that Hallman's compositions are "reminiscent of Dominick Argento, contemporary soundscapes and Renaissance music."[13].