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Team

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Research Team
  • Josh Domeyer, Ph. D.
  • Pujitha Gunaratne, Ph.D.
  • Jason Hallman, Ph.D.
  • John K. Lenneman, Ph.D.
  • Danil Prokhorov, Ph.D.
  • Tina Brunetti Sayer, Ph.D.
  • Rini Sherony
Josh Domeyer headshot.

Josh Domeyer, Ph. D.

Senior Engineer

Josh Domeyer is a senior engineer 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.

Pujitha Gunaratne headshot.

Pujitha Gunaratne, Ph.D.

Principal Scientist

Pujitha Gunaratne is a principal scientist for the Collaborative Safety Research Center (CSRC) at the Toyota Motor North America Research & Development (TMNA R&D) in Ann Arbor, Michigan, where he leads driver state Detection and in-vehicle health monitoring research for advanced safety applications.

Since joining TMNA R&D in 2008, Gunaratne has been involved with driver drowsiness detection using facial images and physiology data, driver attention modeling using simulated and real-world driving, and driver behavior estimation using in-vehicle and surround sensing. He also works on driver health and wellness state detection technologies using physiology and driving data.

Gunaratne has expertise in computer vision and machine learning methodologies and served as an expert in naturalistic driving data analysis for Transportation Research Board of National Academies. He holds more than 10 patents in Advanced Driver Assistance Systems and Intelligent Vehicles from the U.S. and Japan.

He is a senior member of The Institute of Electrical and Electronics Engineers (IEEE) and chairs the Technical Committee of Naturalistic Driving Data Analytics in the IEEE Intelligent Transportation Systems Society. He is also a member of the IEEE Engineering in Medicine and Biology Society, IEEE Computer Science and Society of Automotive Engineers.

Prior to joining TMNA R&D, Gunaratne was a research engineer at Toyota Motor Corporation, Japan for four years, developing driver emotion detection and drowsiness level estimation technologies.

Gunaratne earned master’s and doctoral degrees in Electrical and Computer Engineering from Nagoya Institute of Technology, Japan.

Access his research papers on Google Scholar.

Access his research papers on ResearchGate.

Jason Hallman Headshot.

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 as an associate editor for the SAE International Journal for Transportation Safety, member of the Scientific Program Committee of the Association for the Advancement of Automotive Medicine (AAAM), chairperson of the 2019 Annual Scientific Conference of the AAAM and as an ad hoc reviewer for many scientific journals.

For his work, Hallman has been recognized by multiple organizations. He has been featured in DesignNews magazine as “One of 15 Engineers Transforming the Auto Industry,” has 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 Engineer

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.

Danil Prokhorov headshot.

Danil Prokhorov, Ph.D.

Director

Danil Prokhorov has been involved in research and planning for various intelligent technologies, such as highly automated vehicles, AI and other futuristic systems at TMNA R&D since 2005.

Since 2011, he has been in charge of the Future Research Department and Collaborative Safety Research Center (CSRC, since 2021). His department demonstrated the feasibility of autonomous driving on public roads in 2011, and his department’s efforts in personal flying mobility were pioneering for Toyota, allowing the company to join forces with Joby Aviation in 2020.

He has served as a panel expert for NSF, DOE, ARPA, NAE, SAE for more than 20 years. He was a board member of IEEE Intelligent Transportation Systems (ITS), and he is a fellow of the International Neural Network Society (INNS). Prokhorov is also a recipient of 1999 INNS Young Investigator Award and 2019 INNS Dennis Gabor Award.

Prokhorov was associate editor (AE) of IEEE Transactions on Neural Networks and Learning Systems (2004-2018), and currently serves as Senior Editor of IEEE Transactions on Intelligent Vehicles, AE of IEEE Transactions on Cognitive and Developmental Systems, IEEE Computational Intelligence Magazine and Neural Networks (Elsevier).

He has authored many peer-reviewed publications and more than 100 patents.

Prior to joining Toyota, he was with the Ford Scientific Research Laboratory in Dearborn, Michigan, where he pursued machine learning research focusing on neural networks with applications to system modeling, powertrain control, diagnostics and optimization. Before that, he was in Russia studying system engineering, which included courses in math, physics, mechatronics, computer technologies, aerospace, and robotics.

He earned a Master of Science with Honors in St. Petersburg, Russia, in 1992 and his US Doctorate in 1997.

His publication list is available here

Tina Brunetti Sayer headshot.

Tina Brunetti Sayer, Ph.D.

Principal Engineer

Tina Sayer 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 she leads the investigation of evidence-based countermeasures to reduce risky driving.

Since joining CSRC in 2005, Sayer has led the voice of the customer studies, countermeasures for teen drivers, evaluation of rear field of view and blind spot detection systems, and Society of Automotive Engineers Controls and Displays Committee work. She is also a member of Human Factors & Ergonomics Society and the Society of Automotive Engineers.

Prior to joining CSRC, she worked in human factors engineering for Visteon and Veridian.

Sayer has a doctorate in Human Factors Engineering from Virginia Tech, a master’s degree in Human Factors Engineering & Safety Engineering from Virginia Tech and a Bachelor of Science in Psychology from Boise State University.

Access her research papers on Google Scholar.

Rini Sheroni headshot.

Rini Sherony

Senior Principal Engineer

Rini Sherony 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 she leads active safety, active and passive safety integration, and automated driving research collaborations with research institutes, federal agencies and university partners.

Her research and contributions include the development of standardized test procedures, test targets, sensor requirements, and benefit estimation for active safety systems, such as pre-collision, pedestrian pre-collision system and road departure warning systems.

Since joining TMNA R&D in 1998, Sherony has held various positions in active safety research, system design, evaluation, planning and data analysis.

Sherony has authored and coauthored more than 100 papers and publications. She has been awarded 16 U.S. patents along with several more pending with USPTO, and she is actively involved in SAE Active Safety committees developing pedestrian and bicyclist test target standards and SAE and ISO automated driving test procedures.

Sherony also assists SAE in organizing technical sessions at various conferences along with fellow industry experts, addressing topics such as future challenges of deploying automated driving systems. She is the recent recipient of SAE’s 2019 Forest R. McFarland Award for technical leadership and serves on technical review committees for several international conferences, including IRCOBI, FAST-Zero and Intelligent Vehicle Symposium. She also contributes to technical reviews for industry conferences and journals, such as Accident Analysis and Prevention, and serves on the advisory boards for the Center for Automotive Research, University of Michigan Transportation Research Institute’s Center for Connected and Automated Technologies, M-City research programs and Association for the Advancement of Automotive Medicine.

Sherony has a Master of Science in Electrical Engineering and is a member of the Institute of Electronics and Electrical Engineers.

Access her research papers on Google Scholar.