California Science Center Spokespeople

David Bibas, PhD
Curator of Technology Programs
Creative World Gallery
David is curator, technology programs, at the California Science Center.  He is responsible for Creative World, a 20,000 sq. ft. gallery focusing on technological innovations and the science behind them in the areas of transportation and structures.  He has developed several permanent and traveling exhibits including, Our Urban EnvironmentScience in Toyland, and California Wine: The Science of an Art, and the traveling exhibition Goose Bumps! The Science of Fear. He’s also collaborated on other exhibit projects, such as Ecosystems, the Samuel Oschin Pavilion, and DOGS! A Science Tail, particularly focusing on the creation of audiovisual and interactive media experiences for these exhibitions. 

David has been with the California Science Center for over 30 years; he received his BA in Sociology and International Relations from Hebrew University, Jerusalem, and his MA and PhD in Cultural Anthropology from UCLA.

Kenneth Phillips, PhD
Curator of Aerospace Science
SKETCH Foundation Air and Space Gallery
Samuel Oschin Space Shuttle Endeavour Pavilion


Kenneth E. Phillips, PhD, has served as curator of aerospace science since 1990 and develops the California Science Center Foundation's programs and exhibits on aeronautics and space exploration. As curator, he is responsible for creating the vision that shapes these programs and leading the team in the process that includes concept and storyboard development; multiple phases of design; prototype development and testing; artifact acquisition; audiovisual production; exhibit fabrication and research on visitor learning.

Major projects include Phase III of the Science Center's 25-year Master Plan featuring the space shuttle Endeavour and the Samuel Oschin Air and Space Center; the SKETCH Foundation Air and Space Gallery in Science Court; the Roy A. Anderson A-12 Blackbird Exhibit and Garden; and collaboration on development of the Creative World gallery.

He received his B.S. degree in Physics from the North Carolina Agricultural and Technical State University, an M.S. in General Engineering from the University of Wisconsin and Ph.D. from The Johns Hopkins University in Environmental Engineering.

Perry Roth-Johnson, PhD
Assistant Curator of Aerospace Science
SKETCH Foundation Air and Space Gallery
Samuel Oschin Pavilion Space Shuttle Endeavour


Perry Roth-Johnson is an aerospace engineer and informal science educator. He joined the California Science Center in 2014. As an assistant curator, he makes new exhibits and takes care of artifacts for the Samuel Oschin Air and Space Center, the future home of space shuttle Endeavour. He holds a Ph.D. in aerospace engineering from UCLA and a B.S. in mechanical engineering from UC Berkeley.

Liz Roth-Johnson, PhD
Curator of Life Sciences
World of Life Gallery


Liz Roth-Johnson is a scientist turned science communicator with more than a decade of experience making complex scientific ideas accessible and compelling to broad audiences and is working on plans to update and renew the World of Life gallery. Prior to her tenure at the California Science Center which began in 2019, Liz created popular online food science content, reported science stories for KQED Science, consulted for the Autry Museum of the American West, and designed introductory biology courses for undergraduate students at UCLA.

Liz earned her PhD in Molecular Biology from UCLA and received her BA degrees in Molecular & Cell Biology and Music from UC Berkeley. In addition to her scientific expertise in molecular biology, biochemistry, and human physiology, Liz has a strong foundation in pedagogy and educational psychology from her postdoctoral work as a Discipline-Based Education Research Fellow in the UCLA Department of Life Science Core Education.

Chuck Kopczak, PhD
Curator of Life Sciences
Ecosystems Gallery

Chuck Kopczak, Curator of Life Sciences at the California Science Center, has over 25 years of experience in informal science education settings. Academically, he holds a Ph.D. in Biology from the University of Southern California with a specialization in marine community ecology, and a Master of Science Education in Informal Education from California State University Long Beach. His experience in informal science education includes the design and development of the UCLA Ocean Discovery Center at the Santa Monica Pier. At the California Science Center, he led the team responsible for the development of Ecosystems, a 45,000 square foot master-planned expansion that takes guests on a journey to explore 11 different ecosystems to learn about key ecological concepts and principles by viewing 200 species of live animals along with dozens of interactive science experiences. He curated Dogs! A Science Tail, an interactive exploration of the ancient bond between humans and dogs and is currently working on plans for an expansion and renewal of the World of Life gallery.

Georgina Diaz
Director of Guest Services and IMAX Operations
Bilingual - English and Spanish

Georgina joined the Science Center in 2009, initially as volunteer manager where she increased the number of active participants in Living Collections and Air & Space programs. For the space shuttle Endeavour’s three-day transport through city streets, she recruited and managed over 600 volunteers who answered questions and interacted with literally millions of people who gathered to witness the move. In 2013, she was promoted to director of Guest Services and IMAX Operations where she oversees a staff of 120 and works to make sure guests have a seamless and inspiring experience.

Born in Jalisco, Mexico, Georgina’s family immigrated to the United States when she was one-year old.  She graduated from Manual Arts High School in 1994 and in 1998 earned a Bachelor of Arts degree in Latin American Studies from Pomona College in Claremont.