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, aids in bone density interpretation and distributes bone data from Dual Energy xray absorptiometry (DXA), Computed Tomography (CT), Magnetic resonance imaging 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. Upon completion of his Radiological Science courses. 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 got a job 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.