Check out John Holdren's current and previous haircuts:
John Holdren has had a variety of different hairstyles in the past. He is well recognized as a world-class physicist and university teacher. However, the American scientist and presidential advisor is particularly known for his unusual public appearances and his likable character. Rumors and gossip about the 80-year old's haircut are constantly a topic in celebrity magazines and tabloids. Check out John Holdren's former haircuts right here: