Since 1971, Marshall Long has been engaged in acoustical engineering consulting as principal of the firm he founded. Based in California, USA, Marshall Long Acoustics, has established a national and international reputation, completing over 3,000 projects in architectural acoustics, noise and vibration control, environmental impact assessment, and audio visual design. With engineering degrees from Princeton and UCLA, Dr. Long has taught acoustical engineering courses at UCLA and Southern California Institute of Architecture, and has guest lectured at Cal State Long Beach and USC. He has published numerous papers and articles in the field of acoustics. The author has recently been awarded a US patent on the recording and reproduction of three-dimensional sound. For further information visit the firm's website at mlacoustics.com.