Oliver Ettlin is a network engineer, time-nerd, and multicast enthusiast who spends an unreasonable amount of time making packets arrive exactly when (and where) they should. By day, he wrangles networks to achieve sub-microsecond precision with PTP (IEEE 1588), by night, he experiments with multicast setups that make switches sweat and routers question their existence. With a background in network design and troubleshooting, Oliver has a soft spot for time synchronization, hardware timestamping, and the elegant (and sometimes painful) beauty of distributed systems that almost, but not quite, agree on what "now" means. He loves turning complex timing and networking concepts into practical, knowledge, preferably with live demos, broken configs, a fair bit of humor and the black art of making multicast behave.