Halldór Smárason was born in Iceland in 1989. He completed an Advanced Level Piano Examination in the spring of 2009 concurrently with his college graduation, and holds a B.A.-degree in composition from the Iceland Academy of the Arts and an M.M.-degree in classical composition from the Manhattan School of Music, where he studied as a Fulbright-grantee. In the spring of 2015 he received an internship grant to work with Beat Furrer in Vienna and Graz. Through the years his main teachers include composers Dr. Reiko Füting, Atli Ingólfsson and Tryggvi M. Baldvinsson, and pianist Sigríður Ragnarsdóttir.

Halldór has worked with many renowned artists, including Psappha, TAK, Caput, Oslo Sinfonietta, MSM Symphony, Daniel Lippel, Reykjavík's Trio, Duo Harpverk, Elektra Ensemble, The Iceland Youth Symphony Orchestra, Ensemble NeoN, Marco Fusi and Decoda. Halldór has participated at the Ung Nordisk Musik 2013 and 2014, Nordic Cool in 2013, Sonic Festival 3.0 in 2014 and was a composer-in-residence at Við Djúpið 2011 and Podium Festival 2014.

Through the years Halldór has performed on numerous occasions as a soloist or as part of various groups. In addition to performances, Halldór has scored music for a few films and appeared on several recordings of musical CD’s.