### Simen Kvaal

#### Principal investigator

Simen has a broad background and experience from several scientific fields. He has a PhD in Physics and Applied Mathematics from The Centre of Mathematics for Applications (CMA), University of Oslo, Norway, completed in 2009. The title of the thesis was "Analysis of manybody methods for quantum dots". Since then, he has been a postdoctoral researcher at CMA, and at Department of Mathematics, Eberhard Karls Universität Tübingen in Germany where he worked in the group of Prof. Christian Lubich. Finally, he has been a postdoc at The Centre for Theoretical and Computational Chemistry (CTCC), University of Oslo, working on the ERC Advanced Grant project ABACUS of Prof. Trygve Helgaker.

He has worked on several different topics, producing several
single-author papers in areas as diverse as coupled-cluster
theory in computational chemistry, *ab initio* methods
for many-particle dynamics, full-configuration
interaction-calculations for quantum dots, and effective
interactions in nuclear physics. With collaborators Elias
Jarlebring (KTH, Sweden) and Wim Michiels (KU Luven, Belgium) he
has also published numerical methods for non-linear eigenvalue
problems with applications to Bose-Einstein condensation and
the convergence of perturbation series. On the ABACUS project,
he has been involved in research on the mathematical foundation of
density-functional theory.

### Andre Laestadius

#### Postdoctoral Fellow

Andre is a Swedish citizen, having studied and worked at KTH in Stockholm and Uppsala Universitet, Sweden. Andre obtained his PhD in Applied and Computational Mathematics from KTH in 2014. His PhD thesis was titled "Foundation of Density Functionals in Presence of Magnetic Field", detailing the mathematical formulation of current density-functional theory (CDFT). He has a wide physics and chemistry background and is an award-winning experienced university lecturer.

Andre moved to Oslo in September 2015 to begin his postdoctoral research fellowship. He is currently working on the mathematical foundation of coupled-cluster theory, aiming towards the rigorous understanding of the bivariational principle, a major goal of the BIVAQUM project.

### Rolf Heilemann Myhre

#### Postdoctoral Fellow

Rolf is a Norwegian citizen. After obtaining his PhD from the Norwegian University of Science and Technology (NTNU), he moved to Oslo in fall 2016 to begin a postdoctoral fellowship at the BIVAQUM project. Rolf is an expert on both coupled-cluster theory and implementation, with years of experience since his Master thesis. His PhD thesis is titled "Multilevel coupled cluster theory: Development, implementation and application of multilevel coupled cluster theory for core and valence excited states."

On the BIVAQUM project, Rolf is currently working together with PhD fellow Benedicte Ofstad, detailing and implementing the orbital-adaptive coupled-cluster method. It is hoped that this method, where cluster amplitudes and spinorbitals are fully (bi)variational, may give good results for multireference-type systems.

### Benedicte Ofstad

#### PhD Fellow

Benedicte is a Norwegian citizen. She obtained her MSc titled "Vibrational motion in molecules" from the Norwegian University of Science and Technology (NTNU) in 2014. After a few years working as a Project Engineer at Hydro in Årdal, she returned to theoretical chemistry, moving to Oslo and starting her PhD fellowship at the BIVAQUM project in fall 2016. Benedicte is currently working on the theory and implementation of the orbital-adaptive coupled-cluster method, together with Rolf Heilemann Myhre.