C Citigroup Inc

By Katie Martin And David Enrich 

Hedge fund giant Brevan Howard Asset Management LLP has hired back Chris Cecere, an interest-rates trader who was involved in investigations into efforts to rig benchmark interest rates, people familiar with the matter said.

Mr. Cecere last joined Brevan after leaving Citigroup Inc. in 2010. He was criticized by Japanese authorities in 2011 for his alleged role in efforts to rig the London Interbank Offered Rate, or Libor, in an investigation that has resulted in billions of dollars of fines for several banks. He then moved to Element Capital Management LLC in New York. Now he is rejoining Brevan. A spokesman for the fund declined to comment.

Earlier this week, The Wall Street Journal reported that Brevan Howard was returning to its roots with a renewed focus on interest-rates trading.

Write to Katie Martin at katie.martin@wsj.com and David Enrich at david.enrich@wsj.com