/College of Engineering and Applied Sciences
Department of Mechanical Engineering

Jon Longtin, PhD, PE

Jon LongtinProfessor, Mechanical Engineering

Office: Light Engineering 135

Email Address: jon.longtin@stonybrook.edu

Phone Number: (631) 632-9436

Bio:

Dr. Longtin joined the Mechanical Engineering Faculty at Stony Brook University in 1996 after receiving his Ph.D. degree in 1995 from U.C. Berkeley, followed by a one-year postdoc at the Tokyo Institute of Technology in Japan. His research interests include energy conservation, innovative energy transfer and storage, and energy monitoring and diagnostics, as well as laser materials processing, particularly with ultrafast lasers and the development of sensors for harsh environments. His research has been funded by NSF, DOE, ARPA-E, DOD, NASA, NYSERDA, and a variety of industrial sources.  He is the author of over 200 technical publications and holds 11 issued and pending patents. He has received the Presidential Early Career Award for Scientists and Engineers, two Excellence in Teaching Awards, and an R&D 100 award.  He is a licensed Professional Engineer in New York State, and is a member of the National Academy of Inventors.  He serves as a technical advisor to a number of companies and non-profit organizations.  He served as the Associate Dean for Research and Entrepreneurship (2019–2025), the Interim Dean for CEAS (2021–2023) and the Interim Chair of Mechanical Engineering (2023–2025).  He is the Chair of the Executive Committee for the American Society of Thermal and Fluids Engineers (2025–present). In addition to his academic activities, he cofounded a start-up company, Mesoscribe Technologies, Inc. in 2000, and remained involved until its acquisition in 2018. He is a registered Professional Engineer in New York State (2012). 

Education:

  • University of California, Berkeley, Ph.D. 1995
  • University of Cincinnati, Cincinnati, M.S. 1991
  • University of Cincinnati, Cincinnati, B.S. 1989

Professional Experience:

  • Professor, Department of Mechanical Engineering, (1996–present)
  • Associate Dean for Research, College of Engineering and Applied Sciences (2019–2025)
  • Interim Dean, College of Engineering and Applied Sciences (2021–2023)
  • Interim Chair, Mechanical Engineering, Stony Brook University (2023–2025)
  • Professional Engineer, New York State (2012–present)

Awards & Publications: 

  • Recipient of the 1997 NSF PECASE award (1997)
  • Excellence in Teaching Award (1998 and 2017). 
  • R&D 100 Award (2007)
  • Member, National Academy of Inventors (2016)

Professional Memberships & Service: 

  • Fellow, American Society of Thermal and Fluid Engineers (ASTFE) 
  • Chair of the Executive Committee for the American Society of Thermal and Fluid Engineers (ASTFE) (2025 - Present) 
  • Registered Professional Engineer in New York State (2012–present).

Overview: 

Jon Longtin conducts research in the thermal sciences, with a focus on medical device development, energy conservation, innovative energy transfer and storage, and energy monitoring and diagnostics, as well as laser materials processing, particularly with ultrafast lasers and the development of sensors for harsh environments. 

Highlights & Accomplishments:

  • Invented World’s First Heat Flux Sensor in a Thermal Spray Coating (Patented, Licensed and Commercialized)
  • Developed Novel Laser-Machined Thermal Spray Thermoelectric Generator
  • Invented Low-Cost Convection Solution for Low-Temperature Baseboard Heating

Research Areas:

Research Interests:

  • Medical Devices and Prototyping
  • Thermal Storage and Heat Pipes
  • AI/ML Applied to the Thermal Sciences