David Pisinger is professor in operations research at DTU Management Engineering, and former professor at DIKU, University of Copenhagen. David graduated in mathematics and computer science in 1990, and finished his PhD at University of Copenhagen in 1995. His main research topics include maritime optimization, energy optimization, vehicle routing, railway optimization, and cutting problems. He has written more than 100 papers in leading journals, and a monograph on Knapsack Problems. David Pisinger received the PhD prize of the Danish Academy of Natural Sciences in 1995 for his thesis on Knapsack Problems. Moreover he received the Hedorfs Fonds prize for Transport Research 2013; award of teaching excellence Faculty of Natural Sciences, University of Copenhagen 2000; and the Teaching Prize at DTU Management in 2016. He received the Glover-Klingman prize in 2018 (with Martina Fischetti) and in 2019 he was one of the finalists for the Frans Edelman Award. David has supervised more than 20 PhD students, many of which have received awards and distinctions. Two PhD students have received the VeRoLog dissertation prize, one has received the TSL dissertation award, and one has received the Danish innovation Prize. He is Area editor of Transportation Science, and Associate editor of Transportation Research part C, European Journal of Operational Research, Computers & Operations Research, and many more. Having a background in Knapsack Problems, David can be recognized on always wearing a knapsack.