Arnaldur is born in Reykjavik Iceland, and is a member of American Institute of Architects (AIA) and Architecture Association of Iceland (FÍA).

He is currently the principal of Iceland based Studio A Schram, a small boutique firm focusing on residential projects, housing development and restaurant interiors both in Iceland and US.

Arnaldur received his Bachelor of Architecture degree at Southern California Institute of Architecture (SCI-Arc), and his Master of Science degree in Advanced Architectural Design at Columbia University (GSAPP). Arnaldur has taught at University of Pennsylvania; School of fine arts in Reykjavik Iceland; is a regular critic at GSAPP, NJIT, RPI and NYIT. Prior to studying architecture, Arnaldur received a Baccalaureate in Business from The Commercial College of Iceland in 1999.

Arnaldur has collaborated with Workshop/apd and Rockwell Group; Designing architect and Project Management on ZGR, a 2 story commercial addition in Soho (8,500sqft / 8,000,000$) for Zar Property; B12, interiors for a 25 story residential tower in Brooklyn for Greenland USA; HFZ, amenity spaces of residential redevelopment of 88 and 90 Lexington ave for HFZ Capital Group.

Arnaldur has worked as a project manager for THG Architects in Iceland as well as principal of THG Architecture New York branch. At THG architects, Arnaldur worked on EIR senior housing (4,200m2 / 8,000,000$); Boðaþing Senior Community Center and housing development (10,000m2 / 40,000,000$); second price competition entry for CCH conference and music center which then won the Icelandic planning awards 2006; Kringlan mixed use development planning (50.000m2); and the Icelandic love corporation retrospect installation which was nominated for the Icelandic architecture awards 2007.

Arnaldur has participated in gallery exhibitions in New York, Rio de Janeiro, Reykjavik and Tokyo as well as being published in Forum AID, Architectural review, Bustler, Evolo Magazine, Clear Magazine, Trendhunter, Daily tonic and Hus og Hibyli.