Tomas Björk was a Professor of Mathematical Finance at the Stockholm School of Economics. He was also affiliated with KTH (Royal Institute of Technology), Sweden, and Aarhus University, Denmark. Tomas served as president of the Bachelier Finance Society, co-editor of the journal Mathematical Finance, and a member of the editorial board of Finance and Stochastics and other journals. He published numerous journal articles on mathematical finance, and in particular is known for his research on point process driven forward-rate models, consistent forward-rate curves, general interest-rate theory, finite-dimensional realizations of infinite-dimensional SDEs, good deal bounds, and time-inconsistent control theory. Tomas was the author of the widely used and influential textbook, Arbitrage Theory in Continuous Time, which is now in its fourth edition. He passed away in 2021. Mariana Khapko is an Assistant Professor of Finance at the University of Toronto, Canada. She is also an affiliated Research Fellow of the Swedish House of Finance at the Stockholm School of Economics. Her research focuses on financial mathematics and financial markets. She has published articles on time-inconsistent control theory, asset pricing and portfolio choice, information in securities markets, and financial market design. Mariana obtained her Ph D in Finance from the Stockholm School of Economics, under the supervision of Tomas Björk. Agatha Murgoci currently works as a senior quantitative developer at Ørsted, a leading off-shore wind energy company. Prior to this, she was an assistant professor at Copenhagen Business School and at Aarhus University, Denmark. She has published papers on time-inconsistent control theory, good deal bounds, convexity corrections, and the dynamics of sovereign and bank CDS spreads. Agatha obtained her Ph D in Mathematical Finance from the Stockholm School of Economics, under the supervision of Tomas Björk.