A.T. Kearney
From 1953 to 1969, Stewart-Clark worked with the family firm of J. &amp; P. Coats Ltd in Uruguay, Canada, Spain, Holland, Portugal and Pakistan. In 1969, he joined Philips, and he was Managing Director of Philips Electrical Ltd from 1970 to 1975, and of Pye Ltd. from 1975 to 1979. From 1979, he served as a non-executive director of several firms, including A.T. Kearney and TSB Scotland.