About Us


  • Summit Automotive Partners is an integrated group of successful dealerships committed to building lasting relationships with our customers, employees, manufacturers and local communities. Our broad resources and technology capabilities, combined with the expertise of our dealership partners, allow us to create an unmatched sales experience. We will continue to fuel our growth through customer and employee empowerment, acquiring or partnering with outstanding dealership groups and by bringing out hallmark collaborative approach to every facet of our operations.


Our Story


  • Summit Automotive Partners is a privately-held automotive management group headquartered in Denver, Colorado. We are owned by Mr. George Gillett and family with partners. The Gillett family owns or is partners with some of the most respected brands in the world today. Summit Automotive Partners was founded based on a set of firm beliefs: long-term relationships, the empowerment of employees and customers and the innovation and creativity that come from a positive work environment. It’s not business as usual – it’s business as it should be.


Our Dealership Network

All of our dealerships are built on small town values but have the advantage of a big town network to support them. This network enables each to offer superior selection and volume, distinctive leadership and a consistency of experience that our customers have come to expect from their neighborhood dealership. Summit Automotive Partners is building its dealership network through the acquisition of dealerships and dealership groups with excellent track records in sales, service and customer satisfaction. Our dealership network currently includes: Action Nissan in Nashville, Tennessee; Berlin City Auto Group with locations in Maine, New Hampshire and Vermont; Groove Auto in the Denver Metro area; and Groove Silverthorne in Silverthorne, Colorado. Together, they represent 15 great manufacturer brands. It’s the combined enthusiasm and confidence of our manufacturers and our current and prospective dealership partners that supports our continued growth.

Action Nissan

Nissan is an automaker in action and Action Nissan is Nashville’s favorite Nissan dealer. Just like the city of Nashville, Action Nissan has a youthful, energetic spirit that loves to have fun, enjoy life and takes pride in community. We’re so lucky to live and work in the best of both worlds where the excitement of a thriving city meets the values of the country. Where a handshake still means something and we can take pride that many of the cars we sell are made right here in our own backyard.


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Berlin City Auto Group

At Berlin City, it’s not about getting from Point A to Point B, it’s about the adventures, stories and fun in-between. For over 30 years, we have been passionate about what drives you. We have been the go to dealership for all your automotive needs – whether purchasing a new or pre-owned vehicle, servicing your vehicle or providing wholesale parts. Our philosophy is Easy – a way of doing business that finds a way to satisfy each and every customers with the highest level of service.


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Groove Auto

Groove, a Summit Automotive Company, is built upon a different way of thinking. We are dedicated to excellence, personal growth, processes that support our customer and employee satisfaction. The Groove brand is unique about the Power of Yes – meaning that we will empower your employees to provide our customers with a positive, stress-free experience, whether in sales or service. We want to be known for creating a customer experience that is tailored to their individual needs.


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H.M. Brown

H. M. Brown & Associates is your local automotive sales and leasing brokerage firm, so if you’re ready to obtain your dream car at a competitive price, team up with us today! Our firm has been treating car buyers to straightforward, hassle-free financing and leasing processes since 1986, and we look forward to continuing to do so for many more years to come.

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