Aron transferred to AZ in January 2013, after a successful spell at ADO Den Haag. He had been at ADO since 2009, and had made over 100 appearances for the club. He was a key player in their 2012-13 Eredivisie campaign, which saw them finish in fourth place.
Aron Jóhannsson: The Fiery Tale of an American Soccer Prodigy