A rough 18 months for Mayer Brown got a little worse on Monday, when San Francisco’s Orrick, Herrington & Sutcliffe announced that Raniero “Ron” D’Aversa Jr., the co-chair of Mayer’s restructuring and bankruptcy practice, would join Orrick immediately.

Considered a rising star of the bankruptcy bar, the 44-year-old D’Aversa — whose book of business is said to exceed $5 million by sources familiar with his work and reputation — will be based out of the New York office of Orrick. The firm placed 27th in this year’s Am Law 100 rankings with gross revenues of $772,000 and profits per equity partner of $1.7 million.