The 37th Annual Time and Frequency Metrology Seminar will be held June 5-8, 2012, at the National Institute of Standards and Technology in Boulder, Colorado. The Time and Frequency Division of the National Institute of Standards and Technology is offering the course on understanding clocks, oscillators, atomic frequency standards, RF and optical synchronization, optical oscillators, quantum information, optical cooling and heating; making precise frequency, time, phase-noise, and jitter measurements; and establishing measurement accuracy and traceability. This four-day course is the most comprehensive available.