Our leadership team brings more than 65 years of combined experience in the recycling and plastics industries.

Mike Dulin


Michael Dulin serves at CEO where he brings 25 years of experience in sustainability, waste management and environmental services. Mike is an accomplished executive with keen insight into both commercial strategies and operational efficiency. As an executive, he has led a variety of environmental businesses, including sustainability, recycling, hazardous and non-hazardous waste disposal and collection, wastewater treatment, and environmental remediation and construction.

Mike’s diverse background provides in-depth knowledge of waste processing, infrastructure, waste technology, and a deep network in the environmental field. Mike has held a variety of board chairs throughout his career, and currently supports ByFusion Global, an organization focused on utilizing plastic waste in a variety of building materials. He earned a BA in Environmental Management / Policy from the University of Kentucky, and holds an MS in Environmental Systems and an MSPH in Public Health / Industrial Hygiene from the University of Kentucky.

Eric Bauer Headshot

Eric Bauer


Eric Bauer serves as the company’s CFO, bringing over 20 years of corporate finance, operations, mergers and acquisitions and capital raising experience to Circulus. He most recently served as Executive Vice President and Chief Financial Officer at Sharps Compliance Corp. (NASDAQ: SMED), a high growth medical waste business that was acquired by Curtis Bay Medical Waste Services. At Sharps, he was responsible for all aspects of the company’s financial accounting and reporting; developed company strategy to monitor and optimize the business and handled all mergers and acquisitions and corporate development functions. Prior to that he was Executive Vice President and Chief Financial Officer of Nuverra Environmental Solutions (NYSE: NES), an oilfield logistics and equipment company where he led the finance, capital raising and M&A functions until it was acquired by Select Energy Services (NYSE: WTTR).
Before joining Nuverra, Mr. Bauer served as Managing Director of Mergers and Acquisitions Advisory in the Midstream Energy Group at Evercore Partners where he completed over 65 separate advisory assignments from engagement to close, advising boards of directors, sponsors and executives on strategic merger and acquisition transactions. Prior to his role at Evercore Partners, Mr. Bauer worked in the Investment Banking Divisions at CITI and Lehman Brothers where he supported capital markets and advisory transactions for public and private companies. He also served as a Private Equity Professional at Avista Capital Partners where he participated in principal investing and fundraising for the firm’s private equity funds. Mr. Bauer holds a BBA in Finance, a BA in History, and a Minor in Economics from Southern Methodist University.

Mark Stokes

Vice President of Sales

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

Vice President of Operations

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

Human Resource Director

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 headshot

Marcus San Juan

Director of Supply Chain and Product Development

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.