David Rivera goes everywhere on Rush University Medical Center’s sprawling campus, bringing with him “boxes, lots of boxes.” A supply chain technician, Rivera delivers everything from ultrasound machines to syringes, wherever they’re needed. “The most rewarding part is knowing what I do is helping the patients,” he says. Watch Rivera in this “On the Clock at Rush” video as he makes his way through Rush, making sure his colleagues get what they need to do their jobs.