Spotify's Jennifer Higdon page lists 7 albums; searching for the composer's name gets you a dozen; in this playlist you can find 30 (time to fix the metadata, no?). I fully recommend her music to classical fans who think that classical music died with Mahler, Puccini or Shostakovich. Start with aforementioned works and the Concerto For Orchestra; then try: Blue Cathedral, City Scape, and the Piano Trio.
Get this collection in one Spotify playlist here: Jennifer Higdon: Complete Recordings on Spotify (82 tracks from 30 albums, total time: 9 hours) Ctrl (CMD) + G to browse in album view. See the composer's official site for a a noted discography.