This lecture is being given as part of an international meeting on astronomical imaging. It is, in fact, the first major meeting of people with backgrounds in both optical and radio imaging, and has attracted 200 people from all around the world. One of those is a man who has been an active researcher in microwave and infrared spectroscopy for over half a century. It is my pleasure to introduce that man, Professor Charles Townes from the Space Science Laboratory, University of California, Berkeley. It is clear that throughout his life Professor Townes has been attracted by a series of fundamental challenges. He was already an acknowledged molecular spectroscopist when, in 1951, to solve the problem of short wavelength oscillators, he conceived a system for using excited ammonia molecules that became the ammonia beam maser oscillator. He followed this in 1958 by publishing a paper with his brother-in-law, Arthur Schawlow, that laid the foundations for the development of the laser. These two activities, flowing as they did from the pursuit of the most fundamental physics, paved the way for some of the key elements of modern communications.