Our Team

Tim DeGrado, Ph.D. 

timothy.degrado@cuanschutz.edu

Tim DeGrado, Ph.D., is the Director of the University of Colorado’s Research Imaging Center. Dr. DeGrado received his M.S. and Ph.D. degrees in Medical Physics from the University of Wisconsin-Madison. He completed post-doctoral training in PET radiochemistry and Nuclear Medicine at Kernforschungsanlage Juelich, Germany, and the University of Michigan, respectively. Dr. DeGrado’s research interests have included metabolic imaging of myocardial energy metabolism, tumor metabolism, gene expression monitoring, neurodegeneration, radioisotope production and radiopharmacology. Dr. DeGrado joined the faculty at the University of Colorado School of Medicine in 2020.

Bennett Chin, MD

bennett.chin@cuanschutz.edu

Bennett Chin, MD, is the Chief of Nuclear Medicine and Molecular Imaging at the University of Colorado Department of Radiology. Dr. Chin received his MD degree from the University of Texas, and he completed his Nuclear Medicine fellowship at Johns Hopkins University. Dr. Chin’s research interests have broadly included studies of cellular metabolism, and his practice interests have focused in targeted molecular imaging and therapy of tumors (theranostics). He has served as PI in multiple Phase I-III clinical trials of novel radiopharmaceuticals. Dr. Chin joined the faculty at the University of Colorado School of Medicine in 2017.

Daniel Litwiller, Ph.D., MBA 

daniel.litwiller@cuanschutz.edu

Dan Litwiller. Ph.D., MBA, is a site scientist with GE Healthcare supporting the new PET/MR installation at the CU-RIC. He received his Ph.D. in Biomedical Engineering from Mayo Clinic Rochester, where he also began his career with GE as a site scientist. He spent 5 years at GE’s Applied Science Laboratory in New York City, before moving to Denver in 2019. His research interests include MR application development, deep-learning based image reconstruction, and automation.

Ramesh Karki, MS, CNMT, RT (CT) (MR) 

ramesh.karki@cuanschutz.edu

Ramesh Karki, MS, is the Operations Manager and the Chief Technologist (certified in Nuclear Medicine, CT, and MRI) of the Colorado University – Research Imaging Center.  Ramesh has been with the University research since 2013.

Mehul Lakhani, MBA  

mehul.lakhani@cuanschutz.edu

Mehul Lakhani is the Director of Finance and Administration for the Department of Radiology as well as the CU Research Imaging Center. He holds a MBA in Health Administration and has been with the University of Colorado for 17+ years in multiple capacities. He brings extensive knowledge and experience in successfully managing finance and operations of an academic department that is involved in Clinical, Research and Teaching missions.

Ann Scherzinger, Ph.D., CIIP

ann.scherzinger@cuanschutz.edu

Ann Scherzinger is a faculty member of the Radiological Sciences Division of the Department of Radiology and  of the CU Research Imaging Center.  She received her PhD from the University of Illinois and Medical Physics training at the University of Colorado. Her research interests include developing imaging based biomarkers of body composition and adiposity.

 Mike Silosky, M.S.

michael.silosky@cuanschutz.edu

Mike Silosky, M.S. is the nuclear medicine physicist supporting the CU-RIC as well as Anschutz Medical Campus, UCHealth, and Children’s Hospital Colorado.  He received his M.S. in medical physics from the University of Texas Graduate School of Biomedical Sciences, M.D. Anderson Cancer Center.  While he has performed a variety of roles since joining the CU faculty in 2013, his research interest currently focus on small lesion detectability using novel radiotracers for PET imaging.Jessica Ruvalcaba

 Mark S. Brown, Ph.D.

mark.s.brown@cuanschutz.edu

Mark Brown is a faculty member of the Radiological Sciences Division of the CU Department of Radiology and is an MR physicist working with CU-RIC, Brain Imaging Center and UC Health. He received his Ph.D. in Physical Chemistry from the University of Utah and post-doctoral training with Drs. John Gore and Ian Armitage in the Department of Diagnostic Radiology at Yale University School of Medicine studying the NMR relaxation of water protons in tissue. In 1992, he joined the faculty of the Radiology Department at the University of Colorado, leaving after 4 years to work as a consultant in industry. He rejoined the faculty of CU Dept. of Radiology in 2009. His research focuses on using In-Vivo Magnetic Resonance Spectroscopy to examine the biochemical processes in healthy subjects and in pathology. He is also the Technical Director of The Brain Imaging Center on the CU Anschutz Medical Campus which houses a research-dedicated MRI system which performs research MRI scans for a wide variety of investigators.

Jessica Ruvalcaba 

jessica.ruvalcaba@cuanschutz.edu

Jessica Ruvalcaba is the Front Desk Scheduler/Receptionist that provides administrative support to the clinical side of the center. I moved from to Colorado in April 2021. Originally from San Diego, CA. I have 8 plus years of scheduling and admin support in the healthcare field including radiology. Currently a student at Capella University, majoring in Business Healthcare Administration.

Dan Lopez-Paniagua, Ph.D.

dan.lopezpaniagua@cuanschutz.edu