Meet the people behind Circulus

Mark Stokes is Vice President of Sales for Circulus and responsible for sales and business development. Mark has over 30 years of experience in the plastics materials industry including senior leadership roles in public and private equity portfolio companies. Prior to joining Circulus, Mark served in executive roles at Citadel Plastics Holdings, Daikin America, and Vinmar responsible for materials distribution and engineered compounding companies with P&L up to $300 million revenue. Prior to that, he also held commercial management roles with General Electric Plastics and Dow Chemical.

Mark earned his bachelor’s degree in business and finance from Ball State University. He also completed the executive management program at Emory University Goizueta College of Business.

Stephen Ellis is Vice President of Operations for Circulus and responsible for all operations and is focused on quality, continuous improvement and the scaling of Circulus’ operations. Steve has over 35 years of experience as an Operations Executive in the Plastics Industry in both public and private equity portfolio companies. Prior to joining Circulus Steve has held Operations Executive positions with Berry Global, Amcor, RKW and Keter with P&L responsibilities up to $1BN.

Steve earned his bachelor’s degree in mechanical engineering from State University of New York’s Polytechnic Institute.

JossLynn Castor is Human Resource Director at Circulus. She is a Senior Human Resource leader with over 15 years of experience in progressive Human Resource positions driving thought leadership and change management initiatives. She has a diverse background in Human Resources holding leadership positions in healthcare, transportation, energy, and public safety consulting. Prior to joining Circulus, JossLynn served in executive leadership roles as the Director of Human Resources at Mission Critical Partners and the Vice President of Human Resources at Nuverra Environmental Solutions.

JossLynn has a successful track record of developing and leading human resource functions for companies going through significant changes including mergers & acquisitions, restructuring and organic growth. Her leadership style positions HR to be a strategic business partner with employees, managers, and customers to achieve business results. With an approachable style and strong emotional intelligence, she serves as a trusted advisor to all levels of the organization to help develop strategy and drive continuous improvement.
JossLynn graduated with a Master of Science in Organizational Leadership from Geneva College and earned a Bachelor of Science from California University of Pennsylvania.

Marcus San Juan is the Director of Supply Chain and Product Development at Circulus, overseeing the sourcing of raw materials and expanding product offerings to meet customer demands. He has gained extensive experience in sales, procurement, plastic commodities, and recycling over his career.

Before joining Circulus, Marcus held the position of VP of Sales and Sourcing at HDi Plastics, where he gained exposure to LDPE film extrusion. As the Regional Sales Manager at Avangard Innovative, he successfully managed resin sales, national accounts, and the brokerage segment of the company. In 2017, Marcus played a key role as Avangard Innovative entered the post-consumer resin (PCR) business, where he oversaw raw material sourcing and sales.

Marcus has become an expert in the field due to his extensive knowledge of plastic commodities, recycling markets, and closed-loop circular programs.

He earned his bachelor’s degree in Agricultural Economics from Texas A&M University.

Cameron Williams is Director of Safety, Health, and Environmental at Circulus. He is a Certified Safety Professional and Safety Leader with over a decade of experience in Safety and Environmental roles as a formal and influential leader of people. Cameron has a diverse background in Safety and Environmental holding various leadership positions in manufacturing, oil and gas, construction, services, and energy. Prior to joining Circulus in 2022, Cameron served in a Senior Leadership role as the Sr. Manager of EHS at TDIndustries.

Cameron has a passion for protecting personnel and the environment as well as organizational risk management. His leadership style focuses on getting to know his people and building trusting relationships as a servant leader to employees at all levels of an organization to develop strategic partnerships and work toward long-term solutions to prevent injuries and losses.

Cameron also has a passion for supporting the communities within he lives and operates business. He currently serves on the local LEPC and as a director for Ardmore, Oklahoma’s Chamber of Commerce.

Cameron is a Certified Safety Professional by exam and graduated with a Master of Business Administration from Southeastern Oklahoma State University and earned aBachelor of Science in Occupational Safety and Health from Southeastern Oklahoma State University.