Clark John K.

John K. (Jack) Clark

Executive Director


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With over 20 years’ experience in government workforce development systems and sector development work, Jack brings deep expertise in the areas of worker training and career ladders.  A Ford Foundation/Kennedy School of Government Award for Innovations in State and Local Government winner, prior to joining the Center, Jack served as Deputy Director in the Mayor’s Office of Jobs and Community Services in Boston, MA.

Wang Xinge

Xinge Wang

Deputy Director


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Xinge Wang is the Deputy Director of the Transportation Learning Center and one of this country’s leading experts on workforce demand, training capacity, and future projections of workforce needs.  In 2015, Ms. Wang led the joint research effort of US Department of Transportation, Education and Labor to identify the future workforce needs to strengthen skills training and career pathways of the transportation industry. She has been the key researcher and co-author on many projects funded by US DOT and the Transit Cooperative Research Program (TCRP) focusing on transit workforce development. She has also managed the National Training Consortiums for Rail Car, Signals, Elevator/Escalator, and Traction Power Maintenance, developing standards-based training curriculum for frontline technicians. Under the DOL Transit Apprenticeship Initiative, she works with transit agencies and their local unions on developing and implementing apprenticeship programs for transit operations and maintenance occupations. 

Waller Liz

Liz Waller

Director of Finance


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Liz has extensive experience managing federal grants and an in-depth knowledge of the Uniform Guidance and other federal administrative/fiscal requirements developed through her 30 years of experience in the public accounting and non-profit sectors.  Liz has a bachelor’s degree in accounting from Virginia Commonwealth University. Liz joined the Center in 2008.

Corbett Kenyon

Kenyon Corbett

Senior Program Associate


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Kenyon has been with the Center since 2016. He has a keen interest in workforce development; his work is primarily focused on a U.S. Department of Labor American Apprenticeship Initiative grant helping transit agencies and their unions develop and register apprenticeship programs for a variety of front-line occupations. As a part of that work, he leads the Transit Coach Operator Apprenticeship Committee. Kenyon is also experienced in video production and editing. He has helped produce over 50 instructional videos for the Center’s Rail Car and Signals Maintenance Consortia and has led training to help transit agencies produce their own instructional videos. Kenyon has a bachelor’s degree from the University of Maryland Baltimore County in Media and Communications Studies and is a 2020 graduate of the American Public Transportation Association’s Emerging Leaders Program. Kenyon is active in the Young Professionals in Transportation (YPT), Washington, DC chapter and on numerous APTA committees.

Deibel-Pundt Julie

Julie Deibel-Pundt

Program Director, Instructional Design


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Julie has over a decade experience in instructional systems design, in which she holds a master’s level certificate.  She also has a Master’s in urban planning and Bachelor’s degree in Human Geography.  She’s been employed at non-profits for all of her professional career and was driven to join the Center in 2008 because of her passion around equity and the role mobility plays.  

Greenfield Patricia

Patricia Greenfield

Senior Director for Workforce Education


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Pat has over three decades of experience in labor, management, legal, and workforce education, much of it at the University of Massachusetts Amherst.  At the Transportation Learning Center, she helps develop and support career pathways into frontline positions in transportation, focusing on pre-apprenticeship transit training partnerships--with high schools, workforce development programs, transportation agencies, unions, and colleges—that create career, credential, and degree opportunities, especially for youth in the communities transit serves.  She has a Ph.D. in Industrial and Labor Relations from Cornell University, a J.D. from the Washington University School of Law, and a B.A. in Political Science from the University of Rochester. 

Holdzkom Karitsa

Karitsa Holdzkom

Program Associate


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Karitsa has a background in community and urban planning along with housing and transportation research.  She received her Master’s in Community Planning from the University of Maryland, College Park and her BA in Political Science from the University of Maryland Baltimore County.  Karitsa’s work focuses on TLC’s participation in the American Apprenticeship Initiative. She also has contributed to TLC’s research projects, including several TCRP reports.

Joyner Amri

Amri Joyner

Senior Instructional Design Associate


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Amri has been an instructional designer with the Center since 2011. She has designed courses for the Elevator-Escalator, Signals, Rail Car, and Traction Power consortiums. Prior to working with the Center, Amri designed and delivered training in information technology, union organizing, and leadership development. Amri holds a Masters in City Planning degree from the Massachusetts Institute of Technology and a BA in Geography and Sociology from the University of the West Indies.

Liu Brandon

Brandon Liu

Instructional Designer


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Brandon holds a Master’s in Adult Education and Human Resource Development from James Madison University, and obtained a Bachelors degree in Psychology. His background includes instructional design and organizational development, supplemented with elements of educational technology, E-learning, multimedia development, graphic design and visual literacy. Brandon has been with the TLC since 2019 and serves as one of the instructional designers for the Traction Power Consortium.

Schiavone John J.

John J. Schiavone

Program Director


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John Schiavone has been involved with transit bus maintenance and technology for nearly 40 years.  He served on the APTA staff, authored several Transportation Research Board studies, and is now working with the Transportation Learning Center to advance front-line worker training and apprenticeships.

Williams Joyce E.

Joyce E. Williams

Office Manager


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In addition to performing typical office management functions, Joyce coordinates travel and logistics for the TLC’s national committees. She joined TLC after serving as Office Manager at the Trust for Public Land.

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