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News & Events

John Greenhalgh, Ph.D.

John Greenhalgh


Dr. Greenhalgh earned his A.B. degree in physics from Princeton University in 1976, where as a senior he worked at the Princeton Cyclotron in experimental nuclear physics under the direction of Stuart J. Freedman. He completed his Ph.D. at Stanford University in 1981, where he studied under Mel Schwartz (a 1988 Nobel laureate in physics), specializing in experimental elementary particle physics. In 1981, Dr. Greenhalgh returned to Princeton as a post-doctoral research associate and later became a Lecturer in the Department of Physics. In 1985, he joined FONAR Corp. as a Research Scientist – Engineer and since 1987 has served as FONAR’s Director of MRI Applications Research. In that capacity, Dr. Greenhalgh has had broad responsibilities in pulse sequence programming and software development, field service, and clinical applications. He is now very happy to bring his many years of imaging expertise to bear as a consulting physicist for West Physics.

Dr. Greenhalgh is originally from New City, New York.


  • Doctor of Philosophy in Physics – Stanford University
  • Bachelor of Arts in Physics – Princeton University

Alan G. Rehm, B.S., CNMT, R.T. (BD)(CT)ARRT

Alan Rehm


Mr. Rehm attended the University of Missouri-Columbia and graduated in 1991 with a Bachelor of Health Science in Nuclear Medicine Technology. He also attended Southeast Missouri State University earning a Bachelor of Science in Chemistry (1985) and Bachelor of Science in Secondary Education-Chemistry (1986).

Mr. Rehm has 23 years of increasing responsibility in diagnostic imaging and radiology management. He started his career with 7 years of experience as a staff nuclear medicine technologist and chief nuclear medicine technologist in a 600+ bed hospital at St. John’s Regional Health Center in Springfield, Missouri (now Mercy Hospital). Most recently, he has 16 years of experience at an independent, comprehensive, radiology facility at Kenosha Radiology Center in Kenosha, Wisconsin. Mr. Rehm is very proficient in nuclear medicine, computed tomography, C-Arm fluoroscopy, and Bone Densitometry imaging.

During his career, Mr. Rehm has gained hands-on experience in the preparation and participation of multiple inspection and accreditation organizations including Joint Commission, ACR, Medicare, NRC, and State Agencies. As the sole nuclear medicine technologist at his last position, he was responsible for all aspects of Nuclear Medicine recordkeeping, patient imaging, QC/QA, and ACR phantom imaging. In his role as a technologist/manager, he has written and implemented countless policies and procedures. Mr. Rehm joined West Physics in 2020 as a Nuclear Medicine Consultant.

Mr. Rehm is originally from Dexter, Missouri.


  • Bachelor of Health Science in Nuclear Medicine Technology – University of Missouri-Columbia
  • Bachelor of Science in Education – Southeast Missouri State University
  • Bachelor of Science in Chemistry – Southeast Missouri State University


  • American Registry of Radiologic Technologists – Computed Tomography and Bone Densitometry
  • Nuclear Medicine Technology Certification Board – Nuclear Medicine Technology


Lancer Smith, B.S.



Mr. Smith attended Georgia State University and graduated in 2013 with a B.S. in Physics. While in college, he served as a Learning Assistant where he assisted physics students in labs, tutored, and occasionally gave lectures to the college level physics classes. After graduating college, he taught AP Physics and AP Environmental Science for over 5 years. Mr. Smith joined West Physics in 2019 as an Associate Medical Physicist.


  • Bachelor of Science in Physics – Georgia State University

David Fair, B.S.



Mr. Fair graduated from the University of Louisville with a B.S. in Applied Physics. Upon graduation he began working as a market analyst for a start-up in Houston, TX, responsible for monitoring and reporting trade activity for all U.S.-based aromatic petrochemicals. In 2015, he began his path into the medical industry as a Physics Assistant for the Accredited Dosimetry Calibration Laboratory (ADCL) at MD Anderson Cancer Center, specializing in well-chamber calibration as well as high and low-dose rate brachytherapy source calibration. Mr. Fair joined West Physics in February 2018.

Mr. Fair is originally from Louisville, Kentucky.


  • Bachelor of Science in Applied Physics – The University of Louisville