Who We Are


Sherry Handel

Executive Director

Sherry Handel is the Executive Director of the Additive Manufacturer Green Trade Association (AMGTA), a global trade organization founded to promote the environmental benefits of additive manufacturing. Ms. Handel is an award-winning leader focused on making a meaningful impact through non-profit management, entrepreneurship, and volunteering. Previously, she was Co-founder and Chief Operations Officer of Energy Harvesters LLC, a cleantech startup. She has board-level experience scaling non-profits in the sustainability and tech startup education & training sectors. Ms. Handel earned a BS in Business Administration from Northeastern University, a Certificate in Sustainable Business Practices from the University of Vermont and completed graduate-level studies at Boston Architectural College.


Brian Neff

President & Board Chair

Brian Neff is the Chief Executive Officer of Sintavia, an advanced manufacturer of complex space and defense systems. Mr. Neff founded Sintavia in 2015 after working with metal additive manufacturing at CTS Engines, a jet engine MRO he acquired in 2010 and sold in 2016. Prior to CTS, he was the President of Southern Air, a wide-body cargo airline, from 2007 to 2009, and was its CFO from 2003 to 2007. Mr. Neff is the brainchild of the Additive Manufacturer Green Trade Association which he founded in November 2019. Mr. Neff holds a BA from Dartmouth College and an MBA from Columbia Business School.

Rosa Coblens

Board Director

Rosa Coblens is the Vice President Sustainability, Public Relations & Global Internal Communications at Stratasys – a global leader in polymer 3D printing solutions for industries such as aerospace, automotive, consumer products, and healthcare. For over six years, Ms. Coblens has held several positions at Stratasys focused on corporate social responsibility, employee engagement, strategic communications, and PR. Previously, she was Head of Global Internal Communications at NICE Systems, the worldwide leading provider of both cloud and on-premises enterprise software solutions. Ms. Coblens received an Executive MBA, MA in Non-profit Management, and BA in Art History and English Literature from The Hebrew University of Jerusalem.

Jose Crespo

Board Director

Jose Crespo is General Manager at QC Laboratories Inc., an industrial and commercial non-destructive testing laboratory (NDT) with branches in Hollywood, Florida and Cincinnati, Ohio. Mr. Crespo is a non-destructive testing and inspection professional and a U.S. Air Force Veteran with 18 years of experience in aerospace and NDT processes for the additive manufacturing and space industries. He also has extensive experience in FAA Part 145 shop creation and development, landing gear overhaul and repair program development, DER and repair specification writing/development, aerospace surface coatings and electro-plating, Nadcap Process Accreditation, ISO9001 / AS9100 & AS9110 quality management systems, and training.

John Hartner

Board Director

John Hartner is Chief Executive Officer of The ExOne Company and serves on its Board of Directors. Mr. Hartner has led technology companies for 30 years in the electronics, cleantech, automation and digital printing industries. He founded Digital Industrialist LLC and served as Chief Operating Officer of EnvisionTEC, a healthcare 3D printing leader. Previously he led business units of Dover Corporation, most recently as President and CEO of Dover Printing & Identification Segment. He has served in various leadership roles with FMC Technologies and Rockwell International. Mr. Hartner received an MBA from the University of Chicago and a BS in Mechanical Engineering from Villanova University.

Michael Kenworthy

Board Director

Michael Kenworthy is Chief Technology Officer and Vice President of AM & Materials at Divergent Technologies. He has focused on disrupting conventional products working with various novel manufacturing and material technologies that were successfully delivered into series production. Divergent’s multi-material production system technology eliminates tooling and drives radical innovation, capital reduction, and sustainability in vehicle manufacturing. They built the Czinger 21C, the world’s first 3D printed Hypercar, containing hundreds of generatively-designed AM components. Prior to Divergent, Mr. Kenworthy was the Chief Engineer of AM at Honeywell Aerospace and Technology Program Leader at GE Aviation. He earned a BS in Mechanical Engineering from MIT and a Master of Engineering from Univ. of Wisconsin – Madison.

Tadaharu (Ted) Watanabe, Ph.D.

Board Director

Ted Watanabe is General Manager of Innovation Business Division, operating the businesses of Additive Manufacturing, Advanced Electronics and Biotechnology at Taiyo Nippon Sanso Corporation (a part of Nippon Sanso Holdings, Global Industrial Gas Supplier). Dr. Watanabe has held various positions of innovation and business development within the group and led over ten venture investments. Previously, he was the Vice President of Corporate Business Development at Matheson Trigas, a U.S. subsidiary of Nippon Sanso Holdings. He also served on the boards of directors at various technology ventures including Jilin OLED, Pioneer Materials Inc. and RASIRC Corporation. Dr. Watanabe received a Ph.D. in Material Engineering from Yamanashi University and an MBA from the University of Colorado.

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