Who We Are

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​Our team has come together over the last three years.  With diverse backgrounds, we bring an expansive skillset to cover every aspect of back office management.  Each member of our team is a specialist in their field. Separately, we can help fill or restructure any need you may have.  Together, we form a seamless unit that can be plugged into your business to complete or assist your existing team.   Our ultimate goal is to help you achieve your goals.  We want you to concentrate on growing your business and servicing your clients while we provide you with a stable back office team.  We want to use our skills in business management to help you build the business of your dreams.​

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Marnie O'Brien

CEO

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Marnie is a Rowan Graduate. She began her career working in her family business as an Office Manager.  Since then she's worked in a variety of businesses and achieved organizational such as roles Controller, CFO, and most notably, Vice President of Finance and Administration for AIHE.  Marnie established GC4 in 2012 and has become a well-respected resource for a variety of small to mid-sized businesses in Southern New Jersey and Pennsylvania.  Areas of Experience: Non-Profits, Construction, Professional Services.

 

Kim Postorio

Account Manager

 

Kim is a graduate of Bradford Business School with a diploma in Accounting.  She spent her early years working as a paraprofessional for a prestigious public accounting firm in Philadelphia where she acquired a wide range of experience with a variety of businesses.  She then went into the private industry where she has been a well-versed Controller and System Administrator for many years.  Areas of Experience:  Real Estate Management, Wholesale Distribution, Retail, Manufacturing, Food Services and Construction.