Eliyahu Goldratt was an Israeli physicist, business consultant and writer. He was best known for his work on the theory of constraints, a management method he developed to help organizations improve their performance. Goldratt was born in 1948 and died in 2011 at the age of 63. He was the author of several books on business management, including “The Goal” and “Critical Chain,” which became bestsellers and were widely used in business schools and organizations around the world. More https://en.wikipedia.org/wiki/Eliyahu_M._Goldratt