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Dr. Keyser has served as a director since January 2018 and Chairman since November 2019.

Dr. Keyser founded and has served from 2017 as director, president, and chief operating officer of Renibus Therapeutics, a company developing novel therapies for the diagnosis, treatment, and prevention of kidney disease.

Dr. Keyser also founded ZS Pharma and served since 2008 as a director and chief operating officer of that company until December 2015 when it was acquired by Astra Zeneca for $2.7 Billion.

Dr. Keyser was the inventor of the Mucinex product line for Adams Respiratory Therapeutics. Dr. Keyser developed and executed the R&D and Regulatory strategy for Adams Respiratory Therapeutics as Vice President of Development and Regulatory Affairs during his period there from 1998 to 2004. Adams Respiratory Therapeutics was acquired by Reckitt Benckiser for $2.3 Billion. He was previously employed as Chief Compliance Officer & Vice President Regulatory Affairs, Encysive Pharmaceuticals, Vice President Technical & Regulatory Affairs, Medeva Americas, Sr. Director Regulatory Affairs, Marion Merrell Dow, and Regulatory Principal, Abbott Laboratories.

Dr. Keyser received his Pharmacy degree from Creighton University, a Juris Doctorate from Creighton University, an MPA from the University of Missouri-Kansas City, and a Ph.D. in Economics from The University of Texas at Dallas.