Prof. Sandra Houston is Professor Emerita in the School of Sustainable Engineering and the Built Environment at Arizona State University. Professor Houston’s contributions to the field of geotechnical engineering focus on unsaturated soils and arid region problem soils, including in particular collapsible and expansive soils and unsaturated flow. Sandra has served in numerous leadership positions in the American Society of Civil Engineers (ASCE), Geo-Institute (GI), and the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE). She is a recipient of the 2017 ASCE Terzaghi Award, the 2004 William H. Wisely American Society of Civil Engineers Award, the 2018 Distinguished Lecturer for the Pan-American Unsaturated Soils Conference series, and the 9th Pedro de Alba lecturer. Professor Houston has also served as president of the Geo-Institute, and chair of the ASCE Board-level Committee on Diversity and Inclusion. She was the formational Chair of the Geo-Institute Committee on Unsaturated Soils and served for many years as a USA representative and secretary of the TC106 Committee on Unsaturated Soils.