Hedge fund giant Citadel has hired a former managing director at BlackRock to head up quantitative research for its convertible arbitrage team. Dr. Johnny Kang started earlier this month as an MD in New York. Kang spent the last four years working on BlackRock’s systematic fixed income team as the global head of research and innovation. He’d previously spent two stints at hedge fund rival AQR Capital Management, working across both equities and credit. Kang filled the gap by earning his PhD in business economics and his M.S. in applied mathematics from Harvard University.