A labor and employment partner, Mark Keenan, has left McKenna Long & Aldridge in advance of McKenna’s merger with global megafirm Dentons and joined Nelson Mullins Riley & Scarborough.

Three other labor relations partners from Mc­Kenna joined McGuireWoods earlier in June: Richard Hankins, who led McKenna’s labor and employment team, and Brennan Bolt in Atlanta and Seth Borden in New York