Clayton Mobley

Co-Founder & Managing Partner

205.580.1180 Ext 301

Clayton is a proven executive who achieved early success with a large multi-national industrial company before founding Spartan Value Investors. The Spartan family now consists of six different entities and seven brands, providing exceptional returns with low volatility. Clayton applied the same focused intensity to launching Green Rock in 2017. Clayton created sustainable investment programs at Green Rock that align investors’ best interests with that of the company while maintaining disciplined standards to preserving capital. Throughout his entire experience, Clayton has built four businesses with Total Enterprise Value exceeding $260 million. He also hired and developed four CEOs and eight senior executives.


Robert Israel

Co-Founder & Managing Partner
205.580.1180 Ext 302

Robert brings vast experiences in operating businesses and achieving efficiency. He is currently on the board of Ogre Logistics, providing guidance and strategic directions to the CEO and management team. He invested in Keg Logistics and grew the company’s value 30 times over the course of 3 years. While developing the business, Robert led the merger of Keg Logistics and Atlas Keg Company. The synergy created through the transaction was highly accretive, which led to another dealing with Seaport Capital a year later.


Dan Nguyen

205.580.1180 Ext 308

Dan provides a wealth of experience in investment banking and private equity investing. He has been involved with many transactions during his career, including sell-side M&A, IPO, and acquisition financing. In addition, Dan has a passion for healthcare investing and an appreciation for the healthcare system's complexities. His wife is a pharmacist, and his brother currently attends medical school to be an anesthesiologist. Dan has an MBA from the Wharton School at the University of Pennsylvania and a Bachelor of Science from Brigham Young University.


Bill Nabors


205.580.1180 Ext 306

As COO for, Bill's operational and financial expertise caught the eye of Green Rock where he became the interim CFO for a portfolio company in the mining industry. After restructuring their balance sheet and stabilizing cash flow, he was charged with deploying Green Rock Fund I ($7 million) and Fund II ($23 million). Bill is an expert in underwriting credit transactions for small and medium businesses. Bill has a Bachelor's degree from Samford University.


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Chris Guest

 Operation Executive

(205) 540-6633

Over the past 17 years of his career, Chris has held numerous operational leadership roles across a variety of industries. From 2008 to 2020, he served as Chief Operations Officer for a portfolio of companies in the telecommunications industry, while also driving growth for the family office through strategic investments and acquisitions. Prior to that, he worked in several Engineering and Operations Management positions at United Parcel Service. His strengths and experiences in long-term strategy development, converting strategy into execution, and driving operational excellence fit perfectly into the Abacus investment philosophy. Chris holds a BS and MS in Industrial Engineering from the University of Alabama and remains active in several national engineering societies.