Licensed Medical Physicists

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About Us

Our goal is to provide superior medical physics services to our clients under all circumstances. Our business is built on a foundation of outstanding professionalism, deep understanding of nuclear and radiological physics, and a commitment to always communicate clearly and precisely with our clients. Since the beginning, we recognize the importance of partnering with our clients to develop and maintain mutually respectful business relationships.

Radcom Associates consists of a team of professionally licensed and board certified professionals and support staff. We hold professional licenses to practice in Texas and Florida, as well as certified expert status in New Mexico. With over 70 years of combined experience, our team can handle any modality within radiology and nuclear medicine.

Our Team

Radcom Associates Nuclear Physicists
Lyle Wilson

Lyle Wilson, MS, DABR


Lyle cofounded Radcom in 1999 with the intention of providing best-in-class medical physics consulting. Lyle is a diplomat with the American Board of Radiology and is certified in Diagnostic Radiologic Physics and Medical Nuclear Physics. He is licensed in Diagnostic Radiological Physics and Medical Nuclear Physics in Texas and Florida, and also is listed as a Qualified Expert in New Mexico. Lyle is a member of the American Association of Physicists in Medicine (AAPM), and the Society of Nuclear Medicine (SNM).

Prior to Radcom, Lyle was the Chief of Medical Physics at Baylor University Medical Center in Dallas, Texas where he supervised a team responsible for managing and auditing the Radiation Safety Program under a broad scope radioactive material license. Lyle continues to serve as RSO for several facilities. He has also served on various committees on Radiation Safety, PACS Implementation, Electronic Imaging QA/QC, and Technology Advisory Groups.

Lyle received his BA in Physics from Hendrix College and his MS from the Georgia Institute of Technology in Mechanical and Biomedical Engineering. He is currently an active member of the First Presbyterian Church in Mesquite and enjoys spending time with his wife and three kids.

John Sadler

John Sadler, MS, DABR

Vice-President / Partner

John became a full partner in 2008 after 9 years of active military duty, nearly 20 years in the industry, and 8 years of significant contributions to the growth of Radcom. John's current responsibilities include directing medical physics operations and staff development programs. His 15 years of experience at Radcom spans all modalities in diagnostic radiologic physics.

Before joining Radcom, John served as Health Physicist at Baylor University Medical Center in Dallas working with radioactive waste management and performing evaluations on radiation producing equipment. He also worked in the Radiation Safety Office of Texas A&M University managing the processing of their radioactive waste.

John served 9 years in the US Navy. As an E-6 Submarine Qualified, Machinist Mate, John performed duties as a senior supervisory mechanic aboard the Sturgeon-class submarine USS Pogy and performed various mechanical duties aboard the Los Angeles-class attack submarine USS Houston.

John is active within the industry where he is a member of the American Association of Physicists in Medicine and American College of Radiology (Diplomat – Certified Radiologic Physics). He is certified with the Texas Board of Licensure for Medical Physics for Diagnostic Medical Physics and John is currently actively serving as a facility RSO for medical x-ray use.

Valerie Foreman

Valerie Foreman, MS, DABR

Valerie has been with Radcom since 1999 as the Mammography Specialist. She provides medical physics support to our clients to ensure compliance with State, Federal and ACR or state specific accreditation requirements. She has assisted new clinics in the acquisition of mammography equipment and is currently responsible for managing around 200 units covering all major mammography suppliers. Valerie prides herself on delivering the best customer service to her clients.

Valerie received her MS from the University of Texas, Southwestern Medical Center and is registered in Radiological Technology and Mammography with ARRT. She also is a Diplomat with the American Board of Radiology Diagnostic Radiological Physics.

Paul Cutler

Paul (Duffy) Cutler, PhD, DABR

Duffy has worked in the Dallas area since 2000, initially working for US Oncology adding new imaging services to cancer centers around the country. Drawing on his background in clinical Radiology and PET research, he was recruited to Texas to undertake the implementation of PET and CT imaging services in cancer centers in 15 states across the 1200-physician network of Oncologists.

Prior to that, Duffy worked in academic research at Washington University in St. Louis. With a Ph.D. in Biomedical Physics from UCLA, Duffy joined the faculty at the Mallinckrodt Institute in 1992 as Assistant Professor of Radiology. His early research included some of the early software and hardware developments that enabled PET machines to scan the whole patient in a practical timeframe, which helped pave the way for the routine diagnosis and staging of Oncology patients using PET and PET/CT. As a tenured Associate professor at MIR/Wash U, Duffy taught residents and fellows, and was a key member of the Mallinckrodt Institute team that developed a number of novel PET tracers for both imaging and targeted radiotherapy.

Duffy is board certified by the American Board of Radiology in Diagnostic Radiologic Physics and Medical Nuclear Physics. He is a Licensed Medical Physicist in Texas and is also a Qualified Expert and Medical Physicist in Colorado.

Michael Nimmo

Michael Nimmo, MS

Mike joined Radcom in 2015 as a new Resident after receiving his B.S. and M.S. in Physics from the University of Texas at Dallas. His previous work was in the field of ultrafast optics and spectroscopy, with an emphasis in the utilization of semiconductor nano-crystals - also known as "Quantum Dots" - in solar energy and light emitting diode applications. Mike graduated with a M.S. in Medical Physics from the Georgia Institute of Technology in December 2016. Mike successfully passed the ABR Part 1 exam in Summer 2016 and the ABR Part 2 exam in Diagnostic Imaging in August 2018. Mike graduated the Radcom Associates residency program in September 2018 and stayed on a staff physicist and residency program faculty member. He is certified as a temporary medical physicist in the state of Texas.

Mike enjoys working with individual clients and increasing his expertise in the fields of Diagnostic Imaging and Nuclear Medicine. Mike particularly values building the relationships which are necessary to provide excellent physics expertise to our clients.

In his free time, Mike enjoys playing guitar, lifting weights, and being active within his church community.

Gina Ribis

Gina Ribis, MS

Ms. Gina Ribis is originally from California. She attended the University of California, Riverside where she obtained her bachelor's degree in physics, with a concentration in biophysics. While completing her degree she worked in two research labs; a material science lab, as well as a biophysics lab.

After graduating from the UCR, she attended Georgia Institute of Technology where she obtained her master's degree in medical physics. While at Georgia Tech she completed a clinical rotation in the radiation oncology department of Memorial Health University Hospital in Savannah, GA. At the hospital, Gina performed research on a Fletcher Brachytherapy Applicator in order to establish a calibration curve using Optically Stimulated Luminescence Dosimeters as well as to test the accuracy of calculated to delivered dose to patients.

After graduation from Georgia Tech with her M.S. in medical physics, Ms. Ribis worked as a Health Physicist for the DoD at an Army installation. She was responsible for personnel dosimetry, x-ray surveys, and worked on several joint programs as a subject matter expert.

David Settles

David Settles, PhD

Dr. Settles earned a CAMPEP accredited Doctor of Medical Physics (DMP) degree at the University of Texas Health Science Center at San Antonio (UTHSCSA) and an M.S. degree in Radiological Sciences, also from UTHSCSA. He is the first diagnostic DMP in the State of Texas. He has been trained in all modalities after completing two years of clinical residency and has extensive knowledge of MRI systems as well as MR Spectroscopy. Dr. Settles holds a temporary Texas license in Diagnostic Radiological Physics, and he holds a Certificate of Registration in New Mexico in Diagnostic Medical Physics.

Dr. Settles’ American Board of Radiology (ABR) certification will be complete by May 2021 after the Part 3 oral exams

Courtney Mitchell

Courtney Mitchell, MS, DABR

Joining Radcom early in 2021, Courtney brings a wide breadth of medical physics knowledge to the team. With over five years’ consulting experience in the Austin and San Antonio area, Courtney is a welcome addition to grow Radcom’s footprint within the Texas Hill Country. Courtney attained ABR certification in diagnostic medical physics in 2016 after completing a residency program at West Physics. He completed both his MS in medical physics and BS in biomedical engineering at Georgia Tech.

In his free time, Courtney has always enjoyed playing and watching soccer, but with group activities limited, Courtney has been pleasantly surprised to find new interests in cooking, gardening, fishing and tennis.

Laura Aumen

Laura Aumen, MS

Laura completed her B.S. in Physics at University of Dallas in Irving, Texas, after which she returned to her hometown of Omaha, Nebraska, to pursue an M.S. in Medical Physics at Creighton University. As part of her graduate studies, she conducted a research project on operator exposure in fluoroscopy.

In her spare time, she enjoys spending time with her family, baking, inexpertly making music, and site-seeing.

Sean Cavenaugh

Sean Cavenaugh, MS

Sean joined Radcom in 2019 as a first-year resident, following the completion of his physics bachelor’s and master’s degrees at East Carolina University. His research at ECU focused on integrating fluorescence microscopy with Centrifuge Force Microscopy, a specialized imaging technique within the field of biophysics. He performed his curriculum’s clinical rotation in Vidant Medical Center’s Department of Radiation Oncology.

Before his physics education, Sean was enlisted in the U.S. Army as a paratrooper in the 647th Quartermaster Company, in exotic Fort Bragg, NC. His unit’s mission was to support the Airborne operations of the XVIII Airborne Corps with parachute delivery systems.

Sean is currently certified as a temporary medical physicist in the state of Texas. He is interested in gaining further experience with Diagnostic Imaging modalities and regulations, discovering how to better serve Radcom clientele, and learning to be a better medical physicist in general.


Steven Nowak, MS

Steven completed his B.S. in Biology at Saint Norbert College in De Pere, WI, and later pursued his M.S. in Medical Physics at Purdue University in West Lafayette, IN. After graduating from Purdue University and successfully passing the ABR Part 1 exam, Steven worked as a graduate research assistant for the Department of Radiation Oncology at the University of Iowa Hospitals and Clinics (UIHC). His research contributed to the development of a radiation source model for the Elekta Unity MR-Linac, which utilized a Grid-Based Boltzmann Solver (GBBS) to perform fast and accurate dose calculations in the presence of a strong magnetic field.

When not busy, Steven enjoys tutoring and mentoring students, traveling, strength training, playing sports, and hiking.


Shane Steele, Junior Medical Physicist

Joining Radcom in 2020 as a Junior Medical Physicist, Shane is originally from Baltimore, Maryland. After completing his B.A. in Physics at McDaniel College in Westminster, Maryland, where he helped the physics department as an undergraduate research assistant, he traveled to San Diego, California. Here he pursued an M.S. in Medical Physics at San Diego State University. As part of the curriculum, he worked alongside certified medical physicists at the Naval Medical Center and Genesis Radiation Oncology, gaining experience in both diagnostic and therapeutic medical physics. For his thesis research, he investigated the dosimetric characteristics of Gafchromic EBT3 film and the Landauer nanoDot in the presence of proton fields in comparison to photon fields. This research aimed to determine if there is a linear energy transfer (LET) effect on the dosimeters when used in proton treatments.

In his free time, Shane enjoys watching films, riding his bike, and being outdoors.

Jessica Salazar

Jessica Salazar, Junior Medical Physicist

Jessica grew up in El Paso, TX where she attended the University of Texas at El Paso earning a Bachelor of Science in Physics followed by a Master of Science in Physics. Afterwards, she relocated to Nashville, TN to pursue a Doctorate of Medical Physics at Vanderbilt University. At Vanderbilt she performed research on a non-invasive method of characterization of bowtie filters in CT systems using MATLAB. Jessica joined Radcom Associates in 2020 and primarily covers the West Texas region.

When not at work, Jessica can be found spending her time baking, sewing, or running.


Charles Strain, RT, ARRT

Chuck has a wide range of experience in the Radiographic field where he started in 1995. Today, his emphasis is on Radiation Safety.

He has ample knowledge in this area because of his background, which includes managing the Radiation Dosimetry Program and training staff in Radiation Safety and Protection as a member of the medical physics group for Baylor University Medical Center for 15 years. Chuck was an instructor for the Baylor School of Radiography for 9 years and taught Radiation Safety, Image Production, and X-ray Physics. In addition, he conducted radiation area surveys, patient surveys, and radiation safety counseling to I-131 cancer therapy patients.

He received his Bachelor's Degree in Science from Texas A & M University. While he was trained as a Radiographer at the Baylor School of Radiography in 1997, he became ARRT registered.


Jerry Garcia, CNMT, RT

Gerardo "Jerry" Garcia, originally from Laredo, TX, joined the company in 2017 as a Radiation Safety Specialist. He earned his Assosciate's Degree in Radiologic Technology in 2013 from Laredo Community College and a diploma in Nuclear Medicine Technology in 2016 from PITT Community College.

Jerry worked 3 years as a Nuclear Medicine Technologist at Cigarroa Heart & Vascular institute where he performed general nuclear medicine imaging with a concentration in cardiac imaging. In addition to patient imaging, his duties also included quality control of nuclear medicine instrumentation.

He is registered as a radiologic technologist with the ARRT and as a nuclear medicine technologist with the NMTCB.

Lori Winders

Lori Winders, RT, ARRT

Lori, Field Services Consultant, has years of experience in fluoroscopy, diagnostic radiology, CT, MRI, bone densitometry and education.

She has taught Radiation Safety classes, CEU presentations and was a clinical preceptor for the Baylor School of Radiography students while working for HealthTexas Provider Network.

She received her Radiologic Practitioner Assistant training at Weber State University in Ogden, UT with her clinical training at Baylor University Medical Center Dallas in 2009. She has been ARRT registered since 1993.

Marcia Foster

Marcia Foster

Marci joined Radcom in 2013 in the accounting department, and was promoted to Administrative Manager in 2017. With 20 years of business experience, Marci ensures that Radcom is performing at its highest efficiency in the handling of contracts and all aspects of accounting. In addition, Marci is currently serving as the Human Resource Manager and as the Radcom Medical Physics Residency Program Secretary. Having a great rapport with customers and providing solution oriented process improvement are her primary objectives.

Misty Beltran, BGS

Misty Beltran, BGS

Misty joined Radcom in 2017 as the Accounts Receivable Specialist. She has a bachelor's degree from Texas Woman's University where her main areas of studies included business and English. She has numerous years of experience behind her holding positions such as Marketing Assistant and Customer Service Project Coordinator.

She has a strong work ethic and believes in working as a team to ensure all projects are completed and deadlines are met. Taking on multiple roles in a position is not new to her, which makes her an asset. Her organizational skills and note-taking make it possible for her to perform a variety of tasks at any given time.

In Misty's spare time, she tutors elementary school students and homeschools her daughter. She also volunteers at her church, working in the nursery and teaching Sunday school to toddlers. She enjoys reading, writing, and cross stitching.

Kimberley Sweet-Greene

Kimberley Sweet-Greene

Kimberley joined Radcom Associates in 2018 as a database management specialist. She previously spent 23 years in the mortgage industry. Before joining Radcom, Kimberley spent 8 years in the healthcare industry as a Bloodless Medicine and Surgery Coordinator, Volunteer Coordinator, and Public Relations Coordinator simultaneously at a local hospital. She brings excellent customer satisfaction skills along with the interest and ability to develop new skills.

She loves volunteering and since 2003 dedicates at least 70 hours monthly engaging in volunteer work. Her favorite volunteer assignment is being a Chaplain to women at the Lew Sterrett Justice Center- County Jail.


Dasha Warfield

As the Client Service Administrator Dasha delivers impeccable customer service. With several years of administrative experience, Dasha works with our team to provide positive client experiences while handling day-to-day requests. With the ability to develop new skills quickly and perform a variety of tasks at any given time, she contributes to the success and stellar image of Radcom.

2302 Guthrie Road
Suite 210
Garland, TX 75043

972.222.9984 Main
972.222.9989 Fax

Radcom is hiring

Diagnostic Medical Physicist