The shaft, knop and head are modern. Simon and her husband, Perry Knop, were married in 1987. The firm was founded in 1976 by Knop. This formula can be used to prove Knop and Sahi's formula for the Jack polynomials. The screenplay was written by Patricia Louisianna Knop, based on a novel by Patrice Chaplin. KNOP owns the four newest shuttle tankers in the fleet.