Carl Johan Ragnarsson

I lead the Marketing Science group for Amazon Music. It's a diverse and high-performing group of 50 Scientists, Data Engineers, Analysts and Product Managers. In this role, I'm responsible for all modeling and analytics used my Music Marketing teams, e.g. marketing attribution, targeting and subscription LTV and retention measurement. I also lead the data platform team for Amazon Music. Currently, we are building state-of-the-art LLM-based workflows for Data Analytics which can be used to supercharge Stakeholders.

Notes7

• Quant employment verification: CONFIRMED. Nordea Markets (Copenhagen) roles: Quantitative Analyst 2009-2012 and Controller 2008-2009, per a LinkedIn-derived index profile (index-only, not independent primary-source confirmation). The Quantitative Analyst role tested new derivatives valuation models across credit, FX and commodity products (Matlab/SQL) - the title and duties are quantitative-finance work, and Nordea Markets is the markets/trading arm of Nordic bank Nordea. Identity support: name, IMO 2000 (Sweden) participation, and the Lund University mathematics track line up; the profile is the sole employment source.2012
• Current role: Director, Data Science at Amazon (Seattle), leading the Marketing Science group (~50 scientists, engineers, analysts, PMs) for Amazon Music and its data platform, with LLM-based analytics workflows - per his LinkedIn headline/bio (index-only).2026
• Career is near-fully at Amazon: Customer Analytics Manager (Beijing 2013-2015), Senior Product Manager (2015-2017), Senior Manager of Product Management (2017-2019), Senior Manager Research Science (2019-2022), Sr Manager Research Science (2023-2026), Director Data Science (2026-), preceded by Nordea Markets 2008-2012 and Happylatte data analyst (Beijing 2012-2013); shows a track from analyst/controller to science leadership.2026
• Education: M.Sc. Mathematics, Lund University 2000-2006; exchange studies in Mathematics at University of Waterloo 2001-2002; Ph.D. (not completed) in Mathematics at KTH 2002-2003; Economics at Tsinghua University 2006-2007; Chinese at Beiwai (Beijing Foreign Studies University) 2005-2006 - index-only.2007
• Silver medal at IMO 2000 representing Sweden (26 points, rank 57/461); also participated in IMO 1999 (7 points, rank 315/450) - both before his university studies.2000
• A math solution credited to 'Carl Johan Ragnarsson, Lund, Sweden' appears in Crux Mathematicorum Academy Corner (2000 era), tying the Olympiad identity to Lund mathematics.1999
• Listed as an amateur Go player for Sweden in European Go ranking tables, signalling competitive Go involvement alongside the board-game interest.2004
• Wrote a Medium essay 'Barenpark and boardgame heuristics' (2022-07-30) on a personal account (9 followers), indicating an amateur interest in board-game design/analysis rather than professional writing.Jul 30, 2022