Mott MacDonald continued to expand their international presence in 2013 with the purchase of Habtech Engenharia Ambiental. The purchase of the Brazilian-based environmental consultancy added 80 people to Mott MacDonald's staff. It also purchased PD Naidoo & Associates nine days after the purchase of Habtech. PD Naidoo was a consultancy based in South Africa which added 550 personnel for Mott MacDonald. The acquisitions added to the company's previous year purchases of Canadian consultancy Engineering Northwest, oil and gas firm Procyon, and the oil and gas operations of Mouchel.