David Pfister is project manager at Ypso Facto (Nancy, France), where he is developing the software ChromWorks, which has been used to perform the large majority of the simulations of chromatographic processes shown in this book. He was a doctorate student of Professor Morbidelli at Eidgenössische Technische Hochschule Zürich (ETH Zurich) and graduated in 2015. His Ph.D. thesis focused on protein conjugation, and his research also dealt with the fundamental understanding of protein chromatography. Before joining ETH Zurich, he obtained a master degree in chemical engineering from École Nationale Supérieure des Industries Chimiques (Nancy, France). Lucrèce Nicoud is the recipient of a fellowship from the Swiss National Foundation financing her current research on the crystallization of pharmaceutical ingredients at the Massachusetts Institute of Technology. She was a doctorate student of Professor Morbidelli at Eidgenössische Technische Hochschule Zürich (ETH Zurich) and graduated in 2015. Her Ph.D. focused on protein aggregation, and her research also dealt with the fundamental understanding of protein chromatography. Before joining ETH Zurich, she obtained a master degree in chemical engineering from École Nationale Supérieure des Industries Chimiques (Nancy, France). Massimo Morbidelli is Professor at Eidgenössische Technische Hochschule Zürich (ETH Zurich) since 1996 and at Politecnico di Milano (Italy) since 1991. His research focuses on the production, purification, conjugation and aggregation of therapeutic proteins. Other research activities carried out in his group deal with polymer and colloid science. Professor Morbidelli received the Excellence in Process Development Research Award from the American Institute of Chemical Engineers in 2017 and the Separation Science and Technology Award from the American Chemical Society in 2018 for his work on the continuous production and purification of monoclonal antibodies.