A former Bingham McCutchen partner has slapped his former lawyers at Cotchett, Pitre & McCarthy with a multimillion-dollar professional negligence lawsuit, claiming they mishandled an arbitration where he was seeking millions in unpaid compensation guarantees from his old law firm.

In a complaint filed in San Francisco Superior Court on May 24, lawyers for former Bingham partner Michael DiSanto claims he had a written agreement with the firm that guaranteed him $2.5 million in annual compensation from when he joined in March 2013 through 2015, and at least $1.5 million in 2016, including salary and bonus.