Meet the Team

At Photon Engineering our in-house optical engineering talent has over 100 years of  experience. Combined with our qualified out-of-house network of engineers in Tucson’s Optics Valley, Photon Engineering has become one of the leading optical consulting groups in North America.  Call us today at 1-520-733-9557 to discuss your engineering needs.

Rich Pfisterer

Richard Pfisterer

President and Co-Founder

  • Regarded as one of the world’s leading authorities on scatter theory/measurement and stray light analysis.
  • 35+ years of experience in optical design for imaging and non-imaging systems, software development, analysis of optical systems, beam propagation and physical optics modeling/simulation.
  • Co-Developer of FRED optical engineering software.
  • M.S. and B.S. in Optical Engineering (University of Rochester)
Pat McNenny

Patrick McNenny

Executive Vice President

  • Responsible for Program Management & Engineering Services.
  • 30+ years of experience, designing and analyzing optical systems in the aerospace (TRW, now Northrop Grumman), commercial imaging (ECRM Imaging Systems), and medical device (Baxter Healthcare, Applied Medical) industries.
  • Extensive optical manufacturing experience.
  • B.S. in Optical Engineering (University of Rochester)
Scott Ellis

Dr. K. Scott Ellis

Senior Optical Engineer

  • 25+ years of experience in lens design, optical systems imaging analysis, stray light analysis, and design and analysis of illumination systems.
    Extensive program experience to include LSST (NOAO), Discovery Telescope (Lowell Observatory), TMT MOBIE (UC Santa Barbara), and IRIS (SAO-Harvard).LEAP, the Conformal Optics Program (mid-wave IR sensors with aspheric domes), Javelin (scanning long-wave IR sensor), Picasso and Lidar Tech Sat.
  • Ph.D., M.S. in Optics (University of Arizona) and B.S. in Optical Engineering (University of Rochester)
Jim Harvey

Dr. James Harvey

Senior Optical Engineer

  • 50+ years of expertise: Optical systems design and image analysis, surface scatter phenomena, scalar diffraction theory, X-ray/EUV imaging, sparse array imaging, adaptive optics, optical properties of infrared materials, remote sensing.
  • Industry expert accredited with over 200 technical publications and conference presentations in the areas of optical science and engineering.
  • Ph.D., M.S. in Optics (University of Arizona) and A.B. in Physics (Kansas Wesleyan University)
Karlton Crabtree

Dr. Karlton Crabtree

Senior Optical Engineer

  • 7+ years of experience in polarization analysis, optical system analysis, stray light analysis, and lens design.
  • Optical designer/analyst for numerous polarization dependent systems, including lithography industry systems, optics for the DIII-D fusion tokamak, and NASA remote sensing instruments.
  • Ph.D. in Optics (University of Arizona) and B.S. in Physics (San Diego State University)
Ryan Irvin

Ryan Irvin

Senior Optical Engineer

  • 10+ years of experience modeling of complex optomechanical systems using raytracing programs FRED, Zemax and CodeV to provide system performance predictions and diagnostic forensics.
  • Extensive real-world modeling experience and currently supports several thousand global customers of Photon Engineering’s FRED, by reviewing, modifying and documenting optical models submitted to the customer support team.
  • M.S. in Optics (University of Arizona) and B.S. in Physics (Arizona State University)