Interpersonal Development LLC

Dr. John Brennan specializes in enhancing the selling skills of your sales team, resulting in increased business success. His coaching or training sessions can help shorten your sales cycle, improve your sales presentation, and instill confidence in your team. With decades of experience, John is the author of a groundbreaking book on selling called Consultative Selling Skills, which stresses the importance of building relationships in high-value transactions. He has consulted with distinguished organizations, such as Volvo, the Economist Group, and Shipley Associates, to foster adaptive and resilient sales teams and leaders.

With over 80 published articles on sales and leadership, John has developed a framework for corporate learning on sales leadership based on his research into interpersonal skill development. As the founder of a global sales training company, John recruited and trained a team of diverse experts in instructional design, sales training, and consultation, delivering customized courses to corporate clients around the world. His methods are field-tested and tailored to develop the interpersonal skills of any professional, including salespeople, executives, and managers.

Born in Australia, John is a dual citizen and well-traveled professional who has worked across North America, Europe, the Middle East, Asia, and Australia. He has worked with a variety of clients, including Gannett Company, Equifax Europe, Al Futtain Industries, and the State of Victoria, among others. He also opened and managed a European office in Brussels to facilitate client needs.

John holds a doctoral degree in education from the University of Rochester, where he co-taught Consulting Skills and organizational development at Rochester Institute of Technology. He is currently a co-leader of an initiative to establish a graduate-level Institute of Professional Selling. In his work, John is dedicated to helping clients achieve their maximum potential while honing his own abilities through humility, clarity, and insight.