Keenan represents businesses of all sizes in litigation matters, corporate formation, business development, and protection of intellectual property rights. Since 2017, he has focused his practice on assisting companies operating in the regulated cannabis space, including hemp, marijuana, and ancillary endeavors.

Before joining Frantz Ward, Keenan co-founded Foster & Jones and worked at the Hoban Law Group. In both roles, he guided businesses in the emerging cannabis industry. He serves as counsel and an ex-officio member of the board of directors of Model United Nations of the Far West, a not-for-profit organization that hosts an annual, collegiate model United Nations conference, where students can hone their oratory and international diplomacy skills. Keenan lives in Hudson with his wife Regan and daughters Maisie and Aida.