Bringing the World of Real Estate Together

NAI Sullivan Group is one of the most respected real estate firms in the Oklahoma City area. Founded in 2002, we specialize in selling and leasing real estate both locally and nationally. As a member of NAI Global, with 400 offices worldwide, NAI Sullivan Group is able to integrate and serve our clients in multiple locations throughout the world. 




Owner / CEO

Mr. Bob Sullivan, CCIM, principal owner of NAI Sullivan Group has more than 31 years of commercial real estate experience. Bob is a seasoned entrepreneur with a diverse background in operating successful business ventures over the past 40 years. In 1991 after many successful years in the restaurant business, Bob began his career in commercial real estate. Bob earned the Certified Commercial Investment Member (CCIM) designation in 1995 which is the highest professional certification in commercial real estate. Bob’s company was invited to join the NAI Global network in 2004.


Investment / Industrial Specialist

Mr. Amir Shams primarily focuses on Industrial product type at NAI Sullivan Group. Amir is recognized for his social intelligence, knowledge, problem-solving negotiation skills, and passion for the industry. His goal is to provide optimal real estate solutions that bond his clients’ real estate needs with their overall business strategies. Amir is best known to be candid but tough within the industry. He distinguishes himself by being extremely responsive to client needs. Amir’s pledge is his attention to detail regarding every aspect of the transaction, which guarantees that each deal proceeds as smoothly as possible. Amir has found his niche in the industrial Oklahoma market.


Investment / Industrial Specialist

Mr. Zachary McQueen serves as an industrial specialist working alongside Amir Shams. Specializing in serving tenants, landlords, and investors in all commercial real estate needs: including but not limited to disposition, acquisition, valuation, and property identification.


Investment / Industrial Specialist

Irmon utilized his marketing and negotiating skills to go along with very positive people skills to develop good customer relationships over the last 24 years in Oklahoma City and throughout Oklahoma. Irmon believes Oklahoma City is more and more recognized as a great place to start a business and grow a business in a realistic "Business Friendly Environment' with people that value the qualities as well as opportunities found in Oklahoma. 


Broker Associate / Industrial Specialist

Mr. Darryl Meason has been in the real estate business since 1977. He has successfully developed numerous long-term contacts in the Metro Oklahoma City construction and business community. This experience provided a great opportunity to learn the inter-dependence between client welfare and firm success, a valuable lesson when applied to any real estate transaction.


Industrial Specialist

Clark joined NAI Sullivan Group in April 2021. He has an excellent understanding of market dynamics, real estate finance and the transaction closing process. He is an excellent relationship builder who will be covering Industrial properties and other real estate sectors.

Bobby Sanford


Industrial Specialist 

Bobby Sanford was born and raised in Oklahoma City where he attended Casady School. After High School, he moved to Stillwater where he attended Oklahoma State University and graduated with a bachelor’s degree in Chemical Engineering. Post-graduation, Bobby moved back to Oklahoma City where he started a business with some friends. Unfortunately, the business opened at the beginning of COVID, which ultimately led to its closure. After some soul searching, he decided to jump into commercial real estate and join NAI Sullivan Group.



Director / Vice President-Retail

David Hartnack has worked hard to earn a reputation of success working in the commercial real estate industry.  Since 2006, David has helped retailers with the disposition of excess real estate, right-sizing older stores, finding locations in a crowded market, and helped new brand concepts with market-wide brand rollouts. 


Director / Vice President-Retail

Sam started his real estate career in 2008, working in the Oklahoma City/Tulsa commercial real estate brokerage business. Originally from Dallas, Texas, he graduated from the University of Oklahoma in 2009 with a BA in Business Marketing.  Since that time, Sam has established himself as one of the leading retail sales and leasing brokers in the Oklahoma real estate market. His work ethic and leadership skills have enabled Sam to successfully establish long-term, exclusive relationships with a diverse group of national, regional and local retailers and restaurateurs. His extensive market knowledge and tactical experience have made him a valuable third party asset in achieving client-driven goals.


Retail Specialist

Nathan has been a member of the NAI Retail Team for six years. He graduated from the University of Oklahoma in 2015. At the beginning of 2016, Nathan joined David and Sam to form the NAI Oklahoma Retail Team and has worked diligently to help retail owners solve vacancy issues as well as providing valuable market information to his clients. Nathan’s experience has helped him in building lasting relationships and assisting those with commercial needs.


Retail Specialist / Cannabis Broker

In August, 2015 Krystal began her work in Commercial Real Estate with Johnny Owens Commercial Properties. Krystal helped Heff’s Burger Joint, a restaurant out of Texas, find their first location in Oklahoma in 2017. She commuted from OKC to Lawton for about two years attending network events and doing transactions. Krystal moved to Oklahoma City in August of 2018, and joining NAI Sullivan Group in early 2019


Retail Specialist 

Samuel Dunham was born and raised in Pauls Valley, Oklahoma. He always thought he’d follow in his family’s footsteps in banking, but after graduating from the University of Oklahoma he decided to pursue a career in commercial real estate.



Vice President-Office 

Mrs. Amanda Sullivan is an integral part of the highly successful NAI Sullivan Group. Amanda specializes in the office market working to develop customer relationships and build new business. Amanda is an effective communicator with excellent interpersonal and relationship building skills. Amanda is very outgoing and a very determined individual who is looking forward to working to assist you with your real estate investment.


Office / Investment Specialist

Mr. Matthew Pierce, is an Oklahoma Native, and attended the College of Wooster, Ohio, where he studied economics and was a member of the Wooster’s baseball team. Matthew received Wooster’s “Rookie of the Year Award” his freshman year and was a finalist in the DIII College World Series his sophomore year. Matthew transferred to the University of Oklahoma his junior year and graduated with a Bachelor’s Degree in Multidisciplinary Studies - Business Enterprise.

Matthew is a member of the NAI Sullivan Group Office and Investment team. 



Vice President of Business Development

Commercial Investment / Self-Storage Specialist

Mr. Lester joined Wiggin Properties in 1999 at the time of the merger of Property Resource Group with Wiggin Properties. Previously a Commercial Investment Real Estate Broker with Property Resource Group, Lester specialized in sales and acquisitions of self-storage warehouses, industrial properties, commercial investment properties and land. Mr. Lester has brokered more than $264,324,000 in Self Storage transactions in Oklahoma alone.


Investment / Self-Storage Specialist

Frank Sheehy was born and raised in Houston, Texas. He received his Bachelor's Degree in Finance from the University of Oklahoma in July 2020. Frank was an intern for NAI Sullivan Group in the summer of 2019 and decided to join NAI Sullivan Group full time in the summer 2020.


Investment Specialist

Sam Walter tries to understand each of his clients goals and priorities to better ensure that he also has their best interest in mind. Mr. Walter specializes in helping his clients overcome all types of market conditions by developing comprehensive market analysis that provides his clients with the most up to date market knowledge to help them make the best decision not only for themselves, but for their business and their families.


Investment Specialist

Dirk Erdoes grew up in Oklahoma City. He graduated from Oklahoma State University in December of 2021 with a Bachelor of Science in Business Administration. During his time at Oklahoma State he studied Marketing, Management, and Sales. After interning with NAI Sullivan Group in Summer 2022, he decided to pursue a career in Commercial Real Estate and has since taken on a full-time position upon graduation. 



Marketing & I.T. Director 


Executive Administrative Assistant