John represents the fourth generation of a family of commercial real estate brokers, and currently is a 50% partner with Philip Earley in the Lieberman Earley & Company commercial brokerage firm that originated in 1997. He has represented such well-known enterprises as Amkor Electronics, Inc., Electronics Boutique, Inc., now doing business as GameStop, PECO Energy Company, Safeguard Scientifics, Inc., The Triumph Group, Inc., Streamlight, Inc., Gambone Development Company, Environmental Standards, Inc., J. Loew & Associates, and many others in negotiating agreements that have an aggregate value that exceeds $245 million.

Larger transactions during his brokerage career include: a $12.5 million long-term lease and subsequent sale to Electronics Boutique, Inc. of a headquarters and distribution facility located in West Chester, Pennsylvania, as well as the acquisition of the adjacent 7 acres for the development of an 80,000 square foot warehouse building which was subsequently sold for $5.5 million; a $13 million build to suit sale of a 315,000 square foot warehouse located in western Chester County for EB Games; a $10 million sale, on behalf of J. Loew & Associates, of a 130 acre business park located adjacent to Route 422 and Montgomery County to Gambone Development Company; and a $19.5 million sale of a 140,000 square foot office complex located along Route 202 on the King of Prussia corridor, on behalf of Safeguard Scientifics Inc.

John has been active in the commercial real estate business for over 30 years and has partnered in office, industrial, and apartment development ventures.