Before she took over as chairwoman of Morgan, Lewis & Bockius on Oct. 1, 2014, Jami Wintz McKeon was already in the throes of putting together a transformative mass lateral hire that would ultimately bring more than 500 attorneys to the firm and catapult it to the top of the list of largest law firms based on U.S. attorney head count.

And then, that same fall, she met the head of 80-lawyer Singapore law firm Stamford Law Corp. The two began talking about whether a merger—the first of its kind between U.S. and Singapore firms—would make sense.