Greg Yardley works as a SR. Medical Radiology Technologist and researcher in the NASA Bone Mineral Laboratory and NASA/JSC medical clinic for KBR in the government solutions division. His job requirements are performing and analyzing Dual Energy X-ray absorptiometry (DXA) exams on both retired and active Astronauts. He also extracts, records, and aids in bone density interpretation and distributes bone data from DXA, Computed Tomography (CT), and Magnetic Resonance Imaging (MRI) devises. Greg also performs diagnostic medical X-rays for the NASA/JSC Flight medicine and occupational health clinic. 

Greg began his healthcare career as an Emergency Medical Technician (EMT). He then furthered his medical education and received his certification as a registered Radiology Technologist. Greg has worked as a Radiology Technologist in a trauma level 1 hospital, level III hospital, urgent care, and multi-specialty clinic. At the time of his graduation Greg had also received extensive training not only in X-ray but also DXA, CT, and Ultrasound. In 2011, just previous to his current job, Greg worked as a Bone Density Technologist at a multi-specialty medical clinic where he performed and analyzed over 3000 DXA scans a year on every type of patient imaginable while also running the day-to-day operations of the Osteoporosis center.