Ace USA.

Ace USA has named David J. Brosnan president of Ace casualty risk. Brosnan will lead the casualty risk operations of Ace USA, the division specializing in lead umbrella and excess liability, custom casualty, public entity and environmental liability insurance products. Brosnan will be responsible for implementing and executing the business plans for Ace casualty risk.

Brosnan most recently was senior vice president and zone underwriting officer for Chubb Commercial Insurance.