Here is how to locate Doctor Samuel Billingsley in prototype 2, all you need to is to know how to read the radar that you are using and it will guide you to the people locations. If you are able to read the radar properly then you will be able to find Dr. Samuel. The other way is to follow the video guide below that will take you step by step through new york city and give you the exact location where Dr. Samuel Billingsley is located. There is also many more people that you will need to locate during the entire playthrough of the game. Need additional help to locating other people to complete the missions then take a look at the prototype 2 walkthrough, blackboxes, lair and field ops locations, prototype 2 Blacknet Walkthrough to help you complete all missions.