When a rapidly growing East Coast law firm sought a Chicago presence, its leaders turned to a familiar lawyer to head that office. Parker, Ibrahim & Berg LLC, which started with three lawyers in 2011 in Somerset, N.J., opened a Chicago office this month. It now has 36 lawyers and offices in New York City and Philadelphia that provide services for corporate clients, including large companies, national banks, retailers and financial services companies.Robert J. Emanuel is the local office’s managing partner, …