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Jóhann Helgi Sigurðsson's work experience includes a senior manager role at Eimskip starting in 2003. Prior to that, they worked as a consultant at Cap Gemini Ernst & Young from 2001 to 2003, specializing in operational research and working on various projects for clients such as Hewlett Packard, Centrica, and government departments.

Jóhann Helgi Sigurðsson attended Hagaskóli from 1987 to 1990, although no specific degree or field of study is mentioned. Following this, they attended Menntaskólinn í Reykjavík from 1990 to 1994 and completed their matriculation exam in the field of science. Jóhann Helgi then went on to study at Háskóli Íslands from 1994 to 1998, earning a Bachelor of Science (BSc) degree in Mathematics. Afterward, they attended the University of Strathclyde from 1998 to 2000, where they obtained a Master of Science (MSc) degree in Operational Research.