Michael H. Campbell has left Ford & Harrison for Delta Air Lines Inc., where he will be the executive vice president of human resources and labor relations. The post had been vacant since Robert Colman’s departure in June 2004.

Campbell, one of Ford & Harrison’s founding partners, served in a similar capacity at Continental Airlines from 1996 to 2004 until rejoining the labor and employment firm’s airline group, which represents more than 50 airlines.