Birchenough will jointly head up the technology, media and telecom M&A group in the Americas with Steve Geller in New York. A Credit Suisse spokesman declined to comment.
During his tenure at Deutsche Bank, Birchenough was integral in the spin off of AOL Inc from Time Warner Inc; advised Qwest on its merger with CenturyLink and most recently worked with Deutsche Telekom on its sale of T-Mobile to AT&T Inc.
In his new role at Credit Suisse, he will report into Boon Sim, global head of M&A at the Swiss bank. Birchenough will start in August.
(Reporting by Nadia Damouni)