Dryden Advisory Group, LLC was established in 1997 as a sales and use tax consulting firm with over 500 years of experience throughout the United States. Dryden has over 600 clients including several that are among fortune 500. Dryden's Client base is a wide variety of businesses in the manufacturing, insurance, healthcare, finance, technology, retail, banking, and pharmaceutical industries.

Dryden offers audit defense, reverse audit/refund reviews, compliance, and many other services. Dryden continually educates clients to make them more knowledgeable about the issues that can help them save money and improve their bottom line.