Albert S. Matlack began his career in chemistry with the Manhattan Project before spending 43 years at Hercules Incorporated in Wilmington, Delaware. After he was forced to retire at the age of 70, he volunteered to teach at the University of Delaware, stopping just months before his death at the age of 90 in 2013. He spent more than ten years writing the textbook Introduction to Green Chemistry and compiled the problems covered in Problem-Solving Exercises in Green and Sustainable Chemistry shortly before his death. He was passionately interested in all aspects of chemistry, and devoted his research to problems in the environment caused by chemicals. Andrew P. Dicks is a teaching faculty member at the University of Toronto. After undergraduate and graduate study in the United Kingdom, he became an organic chemistry sessional lecturer in 1999, and was hired as part of the university teaching-stream two years later. He has research interests in undergraduate laboratory instruction that involve designing novel and stimulating experiments, particularly those that showcase green chemistry principles. This work has led to over 45 peer-reviewed publications in the chemistry education literature. He has won several pedagogical awards and is the editor of the textbook Green Organic Chemistry in Lecture and Laboratory . In 2014 he was co-chair of the 23rd IUPAC International Conference on Chemistry Education. Following the passing of Albert S. Matlack, he assumed editorship of Problem-Solving Exercises in Green and Sustainable Chemistry in order to ensure the issues discussed in this book became available to the broader chemistry community.