Meet the Team

Timothy T. Worster,

Founder & CEO

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A language access leader since 2008, Tim Worster sets standards that have raised the bar across the profession, working to make professional interpreting more affordable and streamlined, advocating for credentialing, and further professionalizing the field of interpretation and translation. He co-founded Liberty Language Services in 2011.


With a variety of business experience serving many industries for more than a decade, Tim has built a robust education center at Liberty Language Services and increased the professional profile of interpreters in Virginia and throughout the region and U.S. 


Tim holds a Business Administration degree from Colorado Technical University; his wealth of knowledge in Information Technology makes him a strong asset to the industry. He serves on the Board of Directors of the Virginia Interpreters and Translators Association, and collaborates with and supports many other industry organizations.

Shahela Sharmin,

Owner & Co-Founder


When Shahela Sharmin immigrated to the United States in 1991, she saw firsthand the struggles immigrants face as they try to assimilate into our society. Her father and mother worked hard to provide their children with an education and the chance to make a better life for themselves. Shahela co-founded Liberty Language Services in April 2011 with her husband Timothy Worster, to give back to her community and help immigrants like herself have a voice in the events that occur in their lives.


Beyond language services, Shahela is a detail-oriented and self-motivated professional with more than ten years of experience in software quality assurance and software testing in various industries, projects, and environments. She specializes in SQL statements for backend testing and manual testing of client-server, standalone, and web-based applications on windows and UNIX platforms.


Shahela earned a Bachelor of Science degree in Computer Science in 2004 from George Mason University. She also holds CompTIA Security+ Certification SY0-401 and has a security clearance of “Active DOD Secret.”

Sameh Abdelkader,

Co-Founder & Education Director


Sameh Abdelkader, Director of Education, is the lead instructor for two medical interpreter training courses: the nationally recognized 40-hour Bridging the Gap (BTG) course and The Professional Medical Interpreter, a 40-hour course. Since 2012, Sameh has delivered the BTG course to more than 1,000 students.


With 22 years of experience in education, Sameh brings strong skills in management, teaching, training, recruitment and cultural competency to our organization.


Sameh holds a B.A. in English from Zagzig University in Sharkya, Egypt. In addition to being a licensed trainer for BTG and The Professional Medical Interpreter, he is also a licensed trainer for our legal interpreter training course The Language of Justice. As an educator and member of the IMIA, he adheres to the IMIA Educators Code of Ethics.

• Recipient of 2015 IMIA Distinction in Education Award

Silvia Villacampa,

Managing Director

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Silvia Villacampa, Managing Director, has been part of Liberty Language Services since 2012, and has overseen the establishment of the largest pool of qualified and trained medical interpreters in the Washington, D.C. metropolitan area. Prior to joining the company, she was a freelance medical interpreter in the Washington, D.C. metro area and volunteered as a medical interpreter for the Arlington Free Clinic.


Silvia has more than 20 years of bilingual English/Spanish experience at Federal health information centers such as the Office on Women’s Health, the HHS Office of Minority Health Resource Center and AIDS Info, as well as with local and international health programs.


Silvia has a Bachelor’s degree in International Affairs from the University of Mary Washington. She achieved national certification as a Certified Medical Interpreter in 2013. She also serves as editor of The Beat, our professional development e-newsletter for interpreters with over 2,000 subscribers.

Misti Houglum, SHRM-CP
Language Services Manager


Misti Houglum is the Language Services Manager for Liberty Language Services. She started her position with Liberty as a part-time Scheduling Coordinator in 2014 and worked her way up to a management position where she works directly with Liberty staff, clients, and interpreters to ensure every service we provide meets our high quality standards.

Prior to her work for Liberty, Misti worked for a local domestic abuse shelter and prides herself on her abilities to listen attentively and help people resolve any issues they face. Although her degree prepared her professionally to be an art teacher, she applies the knowledge she gained in college to help train interpreters to be the best they can be.  

Misti holds a Bachelor of Science Degree in Art Education from South Dakota State University. She completed a Human Resources Management Certification course through George Mason University in 2020, and earned her SHRM (Society for Human Resource Management) certification in 2021.