Robert Gregory is a medical physicist and one of the founding members and part owner of INphysics, LLC. Robert has close to 25 years of experience and is certified by the American Board of Radiology in therapeutic radiologic physics.

Prior to INphysics, Robert was a medical physicist in the Indianapolis metropolitan area within large hospital networks. He has also served as a radiation safety officer on an NRC license and held chief medical physicist positions. Robert received his Master of Science degree in radiological medical physics from the University of Kentucky in Lexington, KY, and his bachelor's degree in physics/math from Morehead State University in Morehead, KY. Robert is an approved therapy physicist and approved diagnostic & X-ray tube inspector in the state of Indiana.

Robert’s extensive experience includes intensity-modulated radiation therapy (IMRT), stereotactic radiosurgery (SRS), image-guided therapy (IGRT), shielding calculations, HDR, LDR, CT simulation and intravascular brachytherapy. He has also accepted and commissioned linear accelerators, treatment planning systems, CT Simulators and HDR units.

Part owner of INphysics, Earl Dietrich, is a medical physicist who trained at Mercy Medical Center in Cedar Rapids, IA. He has over 15 years of clinical experience and is certified by the American Board of Radiology in therapeutic radiologic physics. Prior to INphysics, Mr. Dietrich was director of medical physics as Radiation Oncology Associates in Fort Wayne, IN, and a radiation therapy physicist at several medical centers.

Mr. Dietrich received his master of science in nuclear engineering from the University of Missouri in Columbia, MO, and his bachelor’s degree in engineering physics from North Dakota State University in Fargo, ND.

Mr. Dietrich is an approved therapy physicist in the state of Indiana, a non-departmental inspector in the state of Illinois and served as radiation safety officer on an NRC license.  He has extensive experience with advanced treatment techniques, such as SRS, IMRT, IRGT, HDR, LDR, CT Simulation and intravascular brachytherapy and has accepted and commissioned linear accelerators, treatment planning systems, CT Simulators and HDR units.

Bill grew up in the Chicago area and earned a BS degree in physics and chemistry education from Taylor University.  He taught high school science for six years before attending University of Kentucky for his MS degree in Radiological Medical Physics.  He has been working as a medical physicist since 2005 and earned his board certification from the ABR in 2009.  When Bill is not working he enjoys spending time with his wife and two children.

Shawn Hollars joined INphysics as a medical physicist in 2008.  Prior to INphysics, Mr. Hollars worked as a medical physicist in both the Chicago and Boston metropolitan areas.  His clinical training was obtained at Ball Memorial Hospital in Muncie, Indiana, during which time he earned his M.A. in physics from Ball State University.  In addition to this degree, Mr. Hollars also holds a B.S. in physics from Ball State University as well as a M.S. in atmospheric sciences from the University of Washington in Seattle, Washington.  

Mr. Hollars began in the field of radiation therapy physics in 2005.  Since that time, he has gained proficiency with intensity-modulated radiation therapy (IMRT), image-guided radiation therapy (IGRT), stereotactic body radiation therapy (SBRT), high dose rate (HDR) brachytherapy, intraoperative radiation therapy (IORT), shielding design for radiotherapy rooms, as well as acceptance and commissioning of linear accelerators and treatment planning systems.