Research Team
- Josh Domeyer, Ph.D.
- Jason Hallman, Ph.D.
- John K. Lenneman, Ph.D.
- Zhaonan Sun, Ph.D.
- Derek Caveney, Ph.D.
- Ananna Ahmed, Ph.D.
- Daniel Perez Rapela, Ph.D.
Josh Domeyer, Ph.D.
Principal Scientist
Josh Domeyer is a principal scientist for the Collaborative Safety Research Center (CSRC) at Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where he is a member of the Human-Technology Integration team.
He leads the CSRC research team on vehicle automation-other road user communication, which investigates how to design social vehicle automation that interacts with pedestrians, cyclists and non-automated vehicles. He also contributes to other projects at the intersection of human performance modeling and human-machine interaction.
In 2011, he joined Toyota, where his current research focuses on how to encourage safe, comfortable, and efficient interactions between people and vehicles, whether they are drivers, riders or other road users. He has authored or co-authored more than 20 articles, abstracts and papers professionally with scientific and engineering organizations, such as The Institute of Electrical and Electronics Engineers and SAE, exploring how people use technology from a systems perspective. Domeyer has conducted research on human-machine interface design, driver distraction, and the interaction between people and vehicle automation.
Domeyer is the chair of the SAE Safety and Human Factors Committee and is an active expert in the ISO Man-Machine Interface Working Group. He was also awarded the Stephanie Binder Young Professional Award from the Human Factors and Ergonomics Society – Surface Transportation Technical Group in 2016 in recognition of his contributions to automotive safety.
He earned master’s and doctoral degrees in Industrial and Systems Engineering from the University of Wisconsin-Madison. He also has a master’s degree in Experimental Psychology from Central Michigan University.
Access his research papers on ResearchGate and Google Scholar.
Jason Hallman, Ph.D.
Senior Manager
Jason Hallman is senior manager for the Collaborative Safety Research Center (CSRC) at Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where he supports operations, people leadership and research theme development and is as an injury biomechanics safety subject matter expert and co-leader for system safety research.
He currently serves in various capacities on industry collaborations related to safety and automated vehicles, including the SAE International Journal for Transportation Safety, the Advancement of Automotive Medicine (AAAM), and as an ad hoc reviewer for several scientific journals.
For his work, Hallman has been recognized by multiple organizations. He was the 2023 recipient of the Elaine Wodzin Award for Traffic Safety and has been featured in DesignNews magazine as “One of 15 Engineers Transforming the Auto Industry.” He received Best Paper Awards from the Stapp Car Crash Conference and the Association for the Advancement of Automotive Medicine, and has been granted multiple patents. He won the Outstanding Young Alumni Award by Valparaiso University and a graduate research fellowship by the National Science Foundation.
Prior to his current role, Hallman was responsible for automated driving system safety assurance in the Integrated Vehicle Systems division and for the advanced development of future crashworthiness technology in the Vehicle Performance Development division.
He completed a post-doctoral fellowship in injury biomechanics at the Medical College of Wisconsin Department of Neurosurgery, earned a Ph.D. in biomedical engineering from Marquette University and earned a Bachelor of Science in mechanical engineering degree (summa cum laude) from Valparaiso University with an honors designation from Christ College.
Access his research papers on Google Scholar.
John K. Lenneman, Ph.D.
Senior Principal Scientist
John Lenneman is a senior principal engineer for the Collaborative Safety Research Center (CSRC) at the Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where he is responsible for the execution of R&D projects in Human-Technology Integration (HTI).
Since joining CSRC in August 2016, Lenneman has developed an HTI research strategy, oversaw project execution, published and presented findings, and integrated findings into product development.
Lenneman has served in various capacities in his professional community, including as chair of multiple Human Factors and Ergonomics Society technical groups, as a reviewer for multiple journals and conferences, and as a member of numerous ISO and SAE committees. He has authored or co-authored more than 50 articles, papers and abstracts on various topics, including human factors, psychophysiology and health and wellness.
Additionally, he is listed as an inventor on more than 10 automotive related technology patents.
Before joining Toyota, Lenneman conducted user experience research in commercial and consumer goods, conducted user research for a health and wellness start-up company, consulted for multiple technology development companies, and spent more than 10 years conducting automotive human factors research.
Lenneman earned a Ph.D. in Applied Experimental Psychology from Central Michigan University and a Master of Science in Industrial Engineering from the University of Michigan.
Access his research papers on Google Scholar.
Zhaonan Sun, Ph.D.
Principal Scientist
Zhaonan Sun is a principal scientist in the Collaborative Safety Research Center (CSRC) at Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where he leads injury biomechanics safety research projects. His previous research has mainly focused on mechanical characterization and computational modeling of human tissues, which directly contributed to updates for Toyota’s freely available Total Human Model for Safety (THUMS) Version 7.
He currently serves as a member of the Scientific Program Committee of the Association for the Advancement of Automotive Medicine (AAAM) and reviewer for many scientific journals, including Traffic Injury Prevention, Journal of Biomechanics, ASME Journal of Biomechanical Engineering, etc. He earned a Ph.D. in mechanical engineering from the University of Virginia and a Bachelor of Science in Biomedical Engineering (with first honors) from the Hong Kong Polytechnic University. Prior to joining Toyota, he was a senior R&D engineer at Align technology.
Access his research papers on Google Scholar.
Derek Caveney, Ph.D.
Senior Executive Engineer
Derek Caveney is a senior executive engineer within Advanced Mobility R&D at Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where he supports the global development of automated and connected driving technologies for safety, comfort and fuel-efficiency applications.
He joined Toyota in 2005 as a senior research scientist.
Caveney has been a member of the Society of Automotive Engineering since 2007 and represents Toyota at the Automated Vehicle Safety Consortium under SAE-ITC. In 2020, Michigan Gov. Gretchen Whitmer appointed him to serve a three-year term on the Council on Future Mobility and Electrification.
He received a Bachelor of Science in Engineering in Applied Mathematics from Queen’s University, Kingston, in Canada, in 1999 and a Master of Science and Doctor of Philosophy in Mechanical Engineering from the University of California, Berkeley, in 2001 and 2004, respectively.
Ananna Ahmed, Ph.D.
Senior Research Scientist
Ananna Ahmed is a senior research scientist in the Collaborative Safety Research Center (CSRC) at Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where she leads road users’ safety research projects. Her background is in Transportation engineering and focused on researching safety concerns and new safety treatments for vulnerable road users. Prior to joining TMNA R&D, she supported the Federal Highway Administration Turner Fairbank Highway Research Center’s Human Factors Program as an on-site contractor with Leidos, Inc., where she studied the human factors aspect of connected vehicle technology and traffic safety.
Ahmed earned her master’s degree from Kansas State University and her doctoral degree in civil engineering from Oregon State University. Her current research interest includes promoting safe driving behavior through technological intervention, leveraging technologies to detect impairments, and investigating the state of practice of in-vehicle seat restraints for diverse occupants. Her new projects will include leveraging advanced driving assistance systems to promote safe driving behavior.
Access her research publications on Google Scholar.
Daniel Perez Rapela, Ph.D.
Daniel Perez Rapela is a principal scientist for the Collaborative Safety Research Center (CSRC) at Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where he leads research focused on field data analysis and effectiveness of Advanced Driver Assistance Systems (ADAS).
Prior to joining Toyota in 2026, Perez served as a research engineer at the Insurance Institute for Highway Safety (IIHS), where he led the development of virtual testing methodologies and real-world ADAS evaluations. He also operated as an independent consultant specializing in human injury research and simulation for major research institutions. His diverse background includes experience as a research scientist at the University of Virginia’s Center for Applied Biomechanics and as a simulation engineer for SEAT, S.A. (VW-Group) in Spain. He is an active member of the scientific community, serving on the Scientific Review Committee for the International Research Council on the Biomechanics of Impact (IRCOBI) and holding various leadership roles within the Association for the Advancement of Automotive Medicine (AAAM).
He earned his Doctor of Philosophy in Mechanical and Aerospace Engineering from the University of Virginia in 2020. He also holds a combined Bachelor and Master of Science degree in Industrial Engineering from the Universidad de Zaragoza in Spain.
Access his research papers on Google Scholar.
