Mike Blackburn is chairman of Mott MacDonald Group following the retirement of Tim Thirlwall. Keith Howells takes over as group managing director.
Halcrow has confirmed the appointment of John Lawson as managing director of its water and utilities business.
Environmental Simulations International (ESI) has appointed hydrogeologists Andy Singleton and Joe Gomme.
Seth L Pearlman has been named president of DGIMenard, a new venture formed by the merger of DGI and Menard Soiltreatment in the USA.
Mike Bevan from Integrated Geotechnical and Environmental Services has achieved a Specialist in Land Condition qualification.
John Ireland has become contracts manager in the coastal department at Fugro Engineering Services.
Environmental consultant MJCA has appointed Ken Read and Kit Griffiths to strengthen the firm's geotechnical and engineering team.
Dominic Brightman has joined Geotechnical & Environmental Associates, based at the company's Hertfordshire head office.