Dibb Lupton Alsop's Birmingham managing partner is leaving to take up a job in industry.
Nick Seddon will join Geoff Brown Holdings, a Warwickshire-based computer games developer, as chief executive in April next year.
Seddon was the architect of an aggressive period of expansion during his four-year stint as managing partner.
In 1997, the Birmingham office took 14 lawyers alone from Edge Ellison.
Seddon's move comes two weeks after 210-partner Dibbs' north west regional managing partner, Paul Nicholls, took up the reins of the firm's London office.
Chris Rawstron, head of corporate in Birmingham, will replace Seddon as regional managing partner.
Rawstron, one of the lawyers to defect from Edge Ellison, only joined Dibbs just over a year ago.
Seddon will remain as a consultant to Dibbs.
“The job offer has come a little earlier in my career than I had anticipated, but it is a fantastic opportunity and I relish the challenge,” he said.