Hlynur is a senior scientist at the Freshwater  and Aquaculture Division of the Marine and Freshwater Research Institute (MFRI) in Iceland and from 2017 he has been leading the annual monitoring surveys of the salmon stocks in Northeast Iceland, including the rivers in the Six Rivers Project. Hlynur is also a member of the ICES working group on North Atlantic salmon (WGNAS) and was recently nominated by Iceland as a member of the Scientific Advisory Group to NASCO.