Architecture and design practice SDA, which has offices in Leeds and Wakefield, has acquired Harrogate-based practice Jackson & Calvert.
Quantity surveying and project management firm Barrie Tankel Partnership has appointed Duncan Trench and Charles Halvieim as directors and Douglas Pavely as associate director.
Paul Hutchings has been made a partner in PDG Architects (Peterborough Design Group).
Paul Thompson, director of the Design Museum, is to become director of the Smithsonian's Cooper Hewitt National Design Museum in New York.
Consulting engineer Roberts & Partners and lighting consultant Theo Kondos Associates have formed a new joint venture business, kondos roberts.
Simon Cavelle, director of Studies at KLC School of Design, has become the new chairman of the Interior Decorators and Designers Association.
The Wates Group has appointed John Curran as group procurement director, and Ashley Game as group legal director and company secretary.
Allan Leighton will become non-executive chairman of Wilson Connolly with effect from 1 January. He is currently non-executive deputy chairman.