Bechtel announced the appointments of Paul Marsden as President of the company’s Oil, Gas & Chemicals (OG&C) business and Ailie MacAdam as President of its Mining & Metals (M&M) business. Marsden will succeed OG&C President Alasdair Cathcart, who is stepping down after 31 years at Bechtel, and MacAdam will succeed M&M President Paige Wilson, who…