Francis J. Hopcroft, has been teaching civil and environmental engineering at Wentworth Institute of Technology in Boston, MA, since January of 1994. He has written several books on various topics such as hazardous waste management, wastewater treatment, and engineering economics. He has served as the collection editor for the environmental engineering collection at Momentum Press since 2013, and has published or reviewed dozens of professional papers, articles, and presentations. Irena Stojkov, was born in Serbia and grew up in Italy. In 2011, she received a joint MSc/BSc degree in architecture and building engineering from the University of Bologna, Italy. During her college studies, she spent one year as an exchange student at the University of California, Berkeley. She has coauthored papers that have been published by Ecological Engineering, CLEAN-Soil, Air, Water, and Water Science and Technology: Water Supply. Irena moved to Cambridge, MA in 2014 and in 2015 she started working as an architect-in-training for Kleinfelder, a multinational architecture and engineering consulting firm. She is a licensed professional engineer in Italy.