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Director and President

Liberty Munson, Ph.D. is the Lead Psychometrician for Microsoft’s Worldwide Learning organization. She is responsible for ensuring the validity and reliability of Microsoft technical certification and professional programs. She is considered a thought leader in the certification industry, especially in areas related to how technology can fundamentally change our approach to assessment design, development, delivery, and sustainment, and has proposed many innovative ideas related to the future of certification that involve creating “your own” certification, leveraging the power of machine learning and artificial intelligence, and designing “in experience” evaluations focused on performance that completely remove the need for traditional assessments as we think about them today. Prior to Microsoft, she worked at Boeing in their Employee Selection Group, assisted with the development of their internal certification exams, and acted as a co-project manager of Boeing’s Employee Survey. ​


Liberty earned her PhD in Industrial/Organizational Psychology with minors in Quantitative Psychology and HR Management from the University of Illinois at Urbana-Champaign.

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Director and Vice President

Bev Van de Velde is a sailor, skier, paddle boarder, foodie, world traveler, hiker, and occasional fisherwoman, as well as a Senior Manager for Symantec Global Education Services, specializing for 10 years in high stakes certification testing. Her latest challenges include managing a production team, integrating a new company, implementing an LMS, streamlining operations, and evaluating testing approaches such as lab exams, microcredentials, and digital credentials. She also serves on the PTC Board and enjoys receiving and sharing knowledge.

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Catharine Cooper has previously served  on the Board of Directors for the PTC, previously as Chair, and most recently as Marketing Chair in 2020.


Catharine has served in several capacities during her career in the certification, training and testing industries.  She has been at Pearson VUE since 2001 and held positions in Account Management, Strategic Alliances, IT Client Marketing Management, Test Center Operations and Business Development.


Currently, Catharine is serving as a Business Development Manager for Pearson VUE’s Growth Services, a program aimed to drive certification in the IT Industry and support initiatives to close the IT Skills gap.



Kpayah Tamba has 15+ years of experience designing and developing traditional and performance-based certification exams, as well as managing global certification teams. He has led certification teams at Citrix and AppDynamics. He is currently responsible for expanding and deepening Okta’s certification programs. Kpayah is active in the credentialing industry. He is a former President of the Performance Testing Council (PTC) Board of Directors. Kpayah studied Electronics Engineering, Computer Information Systems, and Information Security. He’s also a former Visiting Professor at DeVry University and a former Adjunct Professor at Broward College. Kpayah lives and works full time out of his home office in Prosper, TX.

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Director and Treasurer

Maurilio Gorito is a Credentialing Specialist and is serving as Sr. Manager, Certification Programs at Palo Alto Networks. Maurilio has also served on the Board of Directors of the PTC. Maurilio has expertise in creating and structuring certification programs from the ground up and is passionate with testing and assessment, especially performance-based testing and Psychometrics. Maurilio holds bachelors degrees in Education, Pedagogy and Mathematics from Centro Universitario Geraldo Di Biasi, Brazil.


Maurilio has 30 years experience in the IT field and more than 25 years combined experience in Education, Testing and Assessment. He has served as Director of Global Certification Programs at Pure Storage, lead and structured certification programs as Certification Manager for Riverbed Technology and managed the CCIE Routing and Switching Certification Program for Cisco.

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Vincent has guided numerous programs through the test-development process and accreditation by ANSI under certificate or personnel-certification standards. He was instrumental in developing the process for efficiently creating, reviewing, pilot testing, and scoring performance-based item sets for the Uniform CPA Exam. He served for five years as an assessment specialist at the Educational Testing Service, writing multiple-choice items for the GRE and GMAT. Outside the testing industry, he has worked as a newspaper and journal editor.


Vincent serves as director of test development at Authentic Testing Corporation, providing psychometric and test-development support to several test sponsors.



Sara Clark is an avid reader and a hands-on Aunt. Her favorite childhood game was dress-up and she wanted to be The Boss when she grew up. Sara is the Manager of Certification Program Development at the National Institute for Certification in Engineering Technologies (NICET).


With more than 10 years’ experience in test development, Sara oversees NICET’s program development department. The department’s current challenge is integrating performance examinations alongside certification examinations.

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Executive Director

Marcus Bolton, Ph.D. is a survey and assessment professional with over 15 years of industry experience. Marcus has worked in a number of testing-related capacities including but not limited to an assessment consultant and management consultant. Within his most recent role as testing manager, Marcus oversaw testing operations for one of Southern California’s largest employers—driving various industry innovations within the selection space.


When not overseeing surveys and assessments, Marcus enjoys jiu jitsu, traveling, and spending time in nature.