Sigrid Adriaenssens is a structural engineer and Assistant Professor at the Department of Civil and Environmental Engineering at Princeton University, USA, where she directs the Form Finding Lab. She holds a PhD in lightweight structures from the University of Bath, adapting the method of dynamic relaxation to strained gridshells. She worked as a project engineer for Jane Wernick Associates, London, and Ney + Partners, Brussels, on projects such as the Dutch National Maritime Museum in Amsterdam. At Princeton, she co-curated the exhibition ‘German Shells: Efficiency in Form’ which examined a number of landmark German shell projects. Philippe Block is a structural engineer and architect and Assistant Professor at the Institute of Technology in Architecture, ETH Zurich, Switzerland, where he directs the BLOCK Research Group, and is founding partner of structural engineering consultancy Ochsendorf, DeJong & Block LLC. He studied at the VUB, Belgium, and MIT, USA, where he obtained his PhD. He has received the Hangai Prize and Tsuboi Award from the International Association of Shells and Spatial Structures (IASS) as well as the Edoardo Benvenuto Prize. He developed thrust network analysis for the analysis of historic vaulted masonry and design of new funicular shells. Diederik Veenendaal is a civil engineer and a research assistant at the BLOCK Research Group, ETH Zurich, Switzerland. He received his Masters from TU Delft, Netherlands and started his career at Witteveen+Bos engineering consultants, working on groundfreezing analysis for the downtown stations of the Amsterdam North/South subway line and the structural design for the largest tensioned membrane roof in the Netherlands, the ice skating arena De Scheg. His current research involves the comparison of existing form-finding methods and development of new ones for flexibly formed shells and other structural systems. Chris Williams is a structural engineer and a Senior Lecturer at the University of Bath, UK. He specializes in computational geometry and structural mechanics, in particular for lightweight structures and tall buildings, and his work has been applied by architects and engineers, including Foster + Partners, Rogers Stirk Harbour + Partners and Buro Happold. He worked at Ove Arup and Partners, where he was responsible for structural analysis of the Mannheim Multihalle. Since then, he has worked on such projects as the British Museum Great Court roof, Weald & Downland Museum gridshell, and the Savill Gardens gridshell.