The Endurance Group
Business Consulting and ServicesMaine, United States11-50 Employees
The Endurance Group is a Portland, Maine-based consulting and services firm with a small-to-mid-sized team. Founded in 1998 by Jim Sullivan, who drew inspiration from explorer Ernest Shackleton, the company originally offered outsourced sales and marketing services to professional firms. Over more than two decades, its mission broadened to help clients in B2B, non-profit, and B2C sectors pursue growth through innovative strategies, dependable relationships, and the use of technology, all anchored in integrity and creativity. Today the firm centers on two core offerings: B2B sales and marketing, and AI strategy and deployment. It treats AI as a complement to human-centered work, emphasizing close collaboration with clients to support their success. In May 2022, The Endurance Group announced the launch of Commonality, a platform designed to support referral marketing and brand evangelism in industries such as insurance and real estate.