​101  Vose Avenue
South Orange, NJ 07079-2025
Fax: 973-275-1901
Monday - Friday 9am - 5pm
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Sullivan  & Mattheiss, P.C. was established in 1997 by shareholders John P. Sullivan and Kelly M. Mattheiss. Our firm specializes in representing individuals and small and medium businesses with a variety of legal needs. We base our practice on honesty and integrity and are dedicated to representing each client to the best of our ability. 

Sullivan & Mattheiss, P.C. has been an integral part of the South Orange, NJ community since 1999. Our Areas of Practice include, but are not limited to: 

   - Trust, Estates and Wills  -  Family and Divorce Law  -  Family Mediation  -  Commercial Real Estate  -  Commercial Landlord/Tenant    
 - Corporate and Business Law  -  Civil Litigation  -  Construction Law  -  Guardianships  -  Estate Litigation  -  Collection Litigation

Location and Hours

Practical Legal Solutions

Our Firm

Our firm specializes in assisting individuals and small and medium sized businesses with their legal needs.  With over 30 years of experience practicing law in New Jersey, we provide our clients with practical solutions.   We are dedicated to providing quality legal services in a personal and professional manner in an effort to meet and exceed our clients' expectations.