
Leadership
For nearly four decades, TCG has grown by investing in people, relationships, and service. Here are the leadership team members who help guide our success.
The leadership team
Margaret Jill Cox
Joined WSI in 2008 through its Management Development Program and has led multi-site distribution operations across the Southeast. A Georgia Tech certified Six Sigma Black Belt who serves on the board of Make-A-Wish South Carolina.
Barry Cox
Began operations at Warehouse Services, Inc. in October 1986, working with his father to build the foundation. Since then the company has expanded to 18 states and Canada with over 4,000 employees.
Jeff Denning
Over 18 years in finance and accounting, previously a bank regulator with a federal oversight agency. Joined WSI in 1996 and was appointed CFO in 2006, directing all finance and treasury activities.
Steve Magruder, CPA
A CPA who joined the firm in 2007 as finance manager, advancing to Director of Finance and Vice President of Finance before being named Chief Operations Officer in February 2018.
John Rohlman
Leads operational and commercial supply chain solutions across the United States and Canada. Joined WSI in 1994 and has held roles including Six Sigma Black Belt and transportation maintenance manager.
Chris Apple
Leads retail direct-to-consumer and food and drug distribution operations. Over 25 years of experience in third-party logistics, distribution, and supply chain solutions across multiple markets.
John Weil
Oversees chemical and industrial supply chain operations across North America, including warehousing, distribution, and value-added services. Offers 26 years of management experience, much of it in the plastics industry.
Mike Daniel
Directs growth strategy, development, and operations for the manufacturing, engineering, and commercial business units. Over 24 years of experience, joining WSI in 1999 after roles at Johnson & Johnson and Alltrista.
Phil Stephenson
A 20-year veteran of Industrial Transport Services who rose from material handler to dispatcher to Vice President. Under his guidance ITS grew from a 90-tractor fleet to over 250 power units.
Sam Lurker
Provides leadership in corporate policy, external communications, and client event planning. Since joining in 1998, Sam has directed insurance planning, risk management, and benefits procurement.
Mitzi McLees
Provides leadership in generating documents, managing corporate records, mitigating risk, and protecting corporate status. Joined in 1995 and also leads company-wide employee event planning.
Max Dieterle
Joined TCG in 2011 and now directs automation, systems engineering, and continuous improvement across the network. Holds an operations and logistics MBA from Ohio State, with 25 years of combined IT and operations leadership.
Mike Narance
Spent two decades in linehaul and distribution leadership at Wiseway Transportation and DLI before TCG acquired parent company TLI in 2021. Now runs every TLI operation: dedicated fleets, local pickup and delivery, and a Minnesota public warehouse.
Kelli Rohlman
Joined WSI in 1997 on the quality and customer service team. A Six Sigma Black Belt since 1999, she advances quality systems and facility disciplines across the network.
Amber Thorn
An Indiana native who began with WSI supporting accounts payable while at university. Earned her MBA in 2009 and now leads client finance and management of the corporate investment accounts.
Angela Stephenson
A 28-year career at WSI from Payroll Administrator to Director of Employee Compensation. Her expertise spans international payroll, benefits management, ACA reporting, and audits.
Nate Eisele
Started as a material handler in 1998 and advanced into operational leadership, becoming Corporate Quality Manager in 2009. A certified Six Sigma Black Belt and ISO 9001 and 45001 lead internal auditor.

Jennifer Elsner
Joined WSI as a staff accountant in 2006, earned her MBA in 2011, and was named Director of Accounting for Warehousing in February 2026. She also serves as project manager for the ERP transition.

Patrick Donnellan
An Auburn supply chain graduate with oil and gas logistics experience. Joined WSI in 2016, became Site Manager in 2020, and in 2026 was named Director of Process Improvement.
Drew Gray
Joined WSI in 2008 through its Management Development Program and has led multi-site distribution operations across the Southeast. A Georgia Tech certified Six Sigma Black Belt who serves on the board of Make-A-Wish South Carolina.
Liz Cook
Joined WSI in 2007 and moved through operations, quality, and inventory roles before being named Director of Data Analytics in 2025. Builds the tools that put safety, efficiency, quality, and cost data in front of operations leaders.
Start with a Network Assessment
Bring us your current lanes, warehouses, or brokerage needs. The TCG team will map where TCG, WSI, or another one of our services fit and connect you with the right team.