They succeed C. Scott Gunter, who is leaving the company, Chubb said.

"I want to thank Scott for his service to the company over the past three decades and wish him and his family well," said Mr. Krump.

"It's a great pleasure to appoint Jim to lead our exciting and fast growing small commercial and lower middle market business. This is a high volume, high tech segment where efficiency and ease of doing business is the name of the game, and Jim is a proven insurance executive and business-builder in this space. He understands the importance of offering a 100 percent digital experience for our agents and is the right executive to lead our efforts as we continue to penetrate the $100 billion U.S. small commercial market.

"I am equally delighted to appoint Ben to lead our middle market business, which is a core Chubb franchise. Ben is an experienced and seasoned underwriting executive. His expertise and leadership skills will be instrumental as we execute our ambitious growth strategies and provide the industry's leading product and service capabilities for middle market companies across North America in more than 25 industry practices, each supported by a team of underwriting, claims, and risk engineering professionals."

The company also announced that Alex Wells, executive vice president and commercial insurance regional manager for the Northeast and mid-Atlantic regions, has been named chief underwriting officer for its North America commercial insurance business, succeeding Mr. Rockwell. Mr. Wells reports to Mr. Rockwell and Mr. Williamson.

Mr. Rockwell began his career with Chubb in 1997 as a casualty claims representative. In 1999, he joined the company's casualty department as an underwriter. Throughout his career, he has held a variety of field and home office underwriting positions, such as commercial underwriting manager, multi-line executive field underwriter, excess casualty manager, and commercial insurance primary casualty leader for North America. In 2018, he was appointed chief underwriting officer of Chubb's North America commercial insurance business.

Mr. Rockwell has a B.A. in psychology from North Central College.

Mr. Williamson began his career with ACE in 2013. Prior to ACE's acquisition of Chubb in January 2016, Mr. Williamson was division president of ACE's private risk services business. He also has served as senior vice president and chief operations officer of ACE's global personal and small business insurance business, and as chief operating officer for ACE's international accident and health insurance business.

He was named division president for Chubb's North America small commercial business in 2015. Before joining ACE, Mr. Williamson served at The Hartford from 2005 to 2013 in a variety of underwriting, sales, and strategic planning roles. Prior to The Hartford, he served at Bain & Co. as a consultant.

Mr. Williamson received an M.B.A. from The Wharton School at the University of Pennsylvania and a B.S. in finance from Bryant College.

Mr. Wells joined the company in 1992 as an inland marine underwriting trainee. Throughout his career, which spanned both Chubb and ACE, Mr. Wells has held a variety of field and home office underwriting positions; specialty casualty and construction leader for North America commercial insurance; and, since 2017, commercial insurance regional manager for the Northeast and mid-Atlantic regions. Mr. Wells holds a bachelor's degree in finance from American University.

Learn more: www.chubb.com.