Ramey was chairman and president of Liberty International, a subsidiary of Liberty Mutual Group, from 1997 to 2009. Prior to that, he served as president and CEO of American International Healthcare, a subsidiary of insurer AIG.
Zeller was chairman of the executive board of Hannover Re from 1996 until retiring on June 30. Before that he was a member of the executive board of Cologne Re from 1977 through 1995.
Both are Class II directors, the Bermuda-based company said.