an Icelandic scrum master and computer scientist with a M.Sc. degree in 2007 from Reykjavík University on the topic of a Query Language for Game Trees under supervisor Yngvi Björnsson . GTQL is a language and tool, designed for Testing  and Debugging large search trees.
- Yngvi Björnsson, Jónheiður Ísleifsdóttir (2006). Tools for debugging large game trees. 11th Game Programming Workshop, Hakone, Japan
- Jónheiður Ísleifsdóttir (2007). GTQL: A Query Language for Game Trees. M.Sc. thesis, Reykjavík University
- Yngvi Björnsson, Jónheiður Ísleifsdóttir (2007). GTQL: A Query Language for Game Trees. CGW 2007
- Jónheiður Ísleifsdóttir, Yngvi Björnsson. (2008). GTQ: A Language and Tool for Game-Tree Analysis. CG 2008, pdf