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Coffman Group, LLC | Kansas City & Overland Park, Kansas

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Meet Our Sandler Training Team

A local, regional and national company delivering extraordinary results.


Casey Coffman

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Casey Coffman brings drive, passion and decades of goal-breaking experience to what he and his organization, Coffman Group, Inc., do best: create world-class sales professionals and help CEOs drive lasting growth through training, counsel and ongoing support.


Eric Dunn

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Eric Dunn joined the company in 2003 as an associate and soon became a partner in 2005. Since that time Dunn has been instrumental in growing the company’s corporate sales division. His unique communication skills and coaching abilities stem from a wealth of knowledge and experience in both the corporate and entrepreneurial sectors.

Managing Director

Tom Mulligan

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Tom Mulligan brings to the Coffman Group a record of uninterrupted success in sales and sales training. He is an award winning performer at the fortune 500 level and has helped thousands of small businesses achieve their goals. He understands business owners because he is one.

Development & Program Director

Justin Knox

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Justin Knox has been consulting in the areas of sales, training and organizational development for almost eight years. Justin's areas of expertise provide value-based strategies designed to maximize employee retention and improve employees' personal and organizational growth.

Marketing & Customer Success Manager

Brian Glick

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Brian Glick brings an element of creativity, marketing & business development to the Coffman Group. With extensive experience in sales and account management, he is focused on building productive relationships with both clients and strategic partners.

Senior Associate of Training and Development

Lisa Twidwell

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Lisa Twidwell brings over 20 years of experience with her. She coaches and trains with clients to strengthen current behavior, attitude and techniques as well as acquire new skills, increasing their contribution to their businesses and building their self-esteem.

Business Development Manager

Craig Sargent

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Craig Sargent joined Coffman Group as a top performing lead generator in multiple industries. He is passionate about establishing connections with business leaders to identify key issues in order to open the dialogue for potential solutions. Craig graduated from the University of Kansas in 2014.

Sandler Books

The Sandler library of books includes two Amazon and Wall Street Journal best sellers, as well as the best-selling sales classic for any sales book ever.