Full name Tore Olaus Engset born 1865­, died 1943. Norwegian mathematician/engineer who did pioneering work in the field of telephone traffic queuing theory. The formula he developed is named after him.
External Links: http://www.item.ntnu.no/research/ (in English) http://www.math.uio.no/~bent/koteori.html (in Norwegian)
Bibliography:

Arne Myskja: T. Engset in New Light. The 14th Nordic Teletraffic Seminar (NTS-14), Lyngby, Denmark, August 18-20, 1998.

Arne Myskja: Translation Norwegian – English of Unpublished Report, Kristiania (Oslo) 1915: T. Engset: On the Calculation of Switches in an Automatic Telephone System. Telektronikk, vol. 94, no. 2, pp. 99-142, 1998.

Arne Myskja: The Engset Report of 1915. Summary and Comments. Telektronikk, vol. 94, no. 2, pp. 143-153, 1998.

Arne Myskja: The Man Behind the Formula. Biographical Notes on Tore Olaus Engset. Telektronikk, vol. 94, no. 2, pp. 154-164, 1998.