Century City executive search company Korn/Ferry International announced Tuesday that it has completed its acquisition of the Hay Group, a similar firm. When the $452 million deal was announced in September, Korn Ferry said it would increase its head count by about 70 percent and more than double its overseas reach. Korn Ferry at that time had about 3,900 employees in 37 countries. Hay had about 3,100 employees in 50 countries.

The deal is Korn/Ferry’s biggest acquisition to date.