Open sourcing, or freely allowing computer code to be tested and enhanced by developers, is embraced almost everywhere these days. It's a value that Neal Pawar has instilled in AQR Capital Management in his three years as chief technology officer. Pawar doesn't take all the credit, though. He says the Greenwich, Connecticut-based firm was open sourcing, in a sense, from its start in 1998. For example, its website has a "Cliff's Perspective" section for regular postings by managing and founding principal Clifford Asness, and a library page that says, "Our mindset is to share our discoveries and insights to advance the collective wisdom of the world's investment community." Pawar, 45, leads a team of more than 200 technologists on the mission of identifying and deploying the systems, technologies, and tools best suited to AQR's highly quantitative needs. That means keeping pace with its growing business: AQR's $187.6 billion in both traditional and alternative assets under management as of March 31 was an increase of 22 percent year-over-year, while its employee count of 793 was a 23 percent increase. The firm has also added new capabilities in such areas as cloud computing and advanced analytics through data visualization.
 1. Adena Friedman NASDAQ  2. Catherine Bessant Bank of America Corp.  3. Robert Goldstein BlackRock  4. Jeffrey Sprecher Intercontinental Exchange  5. Lance Uggla IHS Markit |
 6. Shawn Edwards & Vlad Kliatchko Bloomberg  7. David Craig Thomson Reuters  8. Michael Spencer NEX Group  9. Don Callahan Citigroup  10. Elisha Wiesel Goldman Sachs Group |
 11. Michael Bodson Depository Trust & Clearing Corp.  12. Terrence Duffy CME Group  13. Charles Li Hong Kong Exchanges and Clearing  14. Sean Belka Fidelity Investments  15. Chris Concannon CBOE Holdings |
 16. Guy Chiarello First Data Corp.  17. Steven Lieblich Citadel  18. David Rutter R3CEV  19. Blythe Masters Digital Asset Holdings  20. Alfred Spector Two Sigma Investments |
 21. Neil Katz D.E. Shaw Group  22. Lee Olesky Tradeweb Markets  23. Richard McVey MarketAxess Holdings  24. David Gledhill DBS Bank  25. Seth Merrin Liquidnet Holdings |
 26. Antoine Shagoury State Street Corp.  27. Peter Brown & Robert Mercer Renaissance Technologies  28. Lou Eccleston TMX Group  29. Peter Cherecwich Northern Trust Corp.  30. Mike Chinn S&P Global Market Intelligence |
 31. Chris Corrado London Stock Exchange Group  32. Neal Pawar AQR Capital Management  33. Gary Norcross Fidelity National Information Services  34. Steven O'Hanlon Numerix  35. Sebastián Ceria Axioma |
 36. Brian Conlon First Derivatives and Kx Systems  37. Tyler Kim MaplesFS  38. Michael Cooper BT Radianz  39. Robert Schifellite Broadridge Financial Solutions  40. Jim Minnick eVestment |