The CIBL Staff

Todd Guentensberger


Executive Director

After graduating from the University of Iowa (BS, 1996), and earning his teaching certificate in 1997 working with Dr. John Penick, one of the nation’s leading proponents of inquiry-based teaching, Todd began his career in education with Durham Public Schools as a seventh grade science teacher. In 2003 Todd joined CIBL. He leads many of our professional development workshops each year and he helped set up and run the CIBL materials center. Todd is also actively involved with the Association of Science Materials Centers and served on the board from 2006-2008. Todd also serves on the faculty of the Smithsonian Science Education Center’s LASER program, promoting science education reform.

Mara Thomas

Business Manager

Mara Thomas received her Bachelor’s degree in English from Minnesota State University – Moorhead in 2000 and a J.D. from the University of North Carolina at Chapel Hill School of Law in 2003. In 2014, Mara finished a 2-year Accounting program at Durham Technical Community College. She has been with CIBL since May 2007.

Ginny Riley

GinnyProduction Manager

In 1983, Ginny Riley received her Bachelor of Science degree in health and physical education from East Stroudsburg University, the heart of the Poconos, Pennsylvania, and her Master’s of Education in physical education and sport psychology from Temple University in 1988. Ginny has been teaching physical education and coaching for the past 25 years in various private schools. After working with CIBL since 2006,¬†she has found a new family of educators to work with and loves her job as a material packing specialist and production manager. Ginny also enjoys walking half marathon races!

Dave Smith



Dave taught middle and high school science, math, and music, and developed educational programs and materials before coming to CIBL. In 1999, he began working with the Duke University Center for Inquiry-Based Learning (CIBL) to help design the CIBL program and provide training in inquiry-based science teaching in K-8 classrooms. From 2002 to 2013, he directed CIBL.

Tim MacAller


Tim MacAller received his Bachelor’s Degree from the University of California Irvine in 1975 and his Master’s Degree in Botany from Duke University in 1981. He taught 9th and10th graders in a boarding school in Denmark for two years, and has worked as a 5 – 8 grade teacher for Durham Public Schools, Duke School for Children, and Durham Academy. He worked since 2001 as a trainer in inquiry teaching techniques for the Center for Inquiry-Based Learning.