Arndt von Haeseler (born 28 February 1959) is a German bioinformatician and evolutionary biologist. He is the scientific director of the Max F. Perutz Laboratories at the Vienna Biocenter and a professor of bioinformatics at the University of Vienna and the Medical University of Vienna.

Arndt von Haeseler obtained a doctorate in mathematics from the University of Bielefeld in 1988 under the supervision of Andreas Dress and Hans-Georg Carstens.^[1][2] He habilitated in 1994 at the Department of Zoology of the University of Munich,^[1] where he remained as a lecturer until 1998.^[3]

From 1998 until 2001, von Haeseler was a group leader at the Max Planck Institute for Evolutionary Anthropology in Leipzig.^[3] From 2001 until 2005, he was professor of bioinformatics at the University of Düsseldorf.^[1] He was a group leader in bioinformatics at Forschungszentrum Jülich.^[3] In 2005, he joined the Max F. Perutz Laboratories (MFPL) in Vienna, where he leads the Center for Integrative Bioinformatics Vienna (CIBIV).^[1] He is a professor of bioinformatics at the University of Vienna and the Medical University of Vienna.^[4] From 2017 to 2020, he was the scientific director of the MFPL (since 2019 Max Perutz Labs).^[4][5] At the University Vienna, he was the dean of the Center for Molecular Biology.^[6] At the Medical University of Vienna, he was the head of the Department for Medical Biochemistry.^[7]

His research focuses on developing computational methods for the reconstruction of phylogenetic trees.^[3] He co-authored the phylogenetics software packages TREEFINDER,^[8] TREE-PUZZLE,^[9] and its successor, IQ-TREE.^[10][11]

He sits on the editorial boards of Molecular Biology and Evolution and BMC Evolutionary Biology.^[12][13][14]