Karl's been pedaling ever since he was old enough to reach the pedals.
A decisive moment however, was when he was finally old enough to drive. That summer, he really pissed-off his parents over somethingorother, and even though he had his first job to get to, he was grounded from using the car for the rest of the summer. At that point, he became a bicycle commuter ... and it stuck.
In college, he worked at a bike shop, part-time, assembling & wrenching. He raced back then, and was successful at it for a time.
In '85, a bicycle tour brought him through Boulder. After packing-up all his bicycles, and moving here shortly thereafter, he promptly gave up the racing, as the competition around Boulder was entirely too fierce (& downright humiliating) compared to what he was accustomed to in Oregon.
Very early-on in Boulder, he fell-in with the crowd of volunteers promoting Boulder's Bike to Work Day. For many years, he was UCAR/NCAR's Employee Transportation Coordinator (ETC), encouraging & helping fellow employees with alternative transportation issues. And he continues to be an alt-modes activist.
Somewhat more recently, Karl's become an enthusiast of electric-assist bicycles. From his home in the close-in foothills, he finds that an e-bike greatly enhances his ability to get along without a car.