2026 Ole A. Andreassen: Medicine Researcher – H-Index, Publications & Awards

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Medicine	153	1016	934	1	1	1217	130791

Research.com Recognitions

2026 - Research.com Medicine in Norway Leader Award
2025 - Research.com Medicine in Norway Leader Award
2023 - Research.com Medicine in Norway Leader Award
2022 - Research.com Medicine in Norway Leader Award

Overview

Ole A. Andreassen is affiliated with Oslo University Hospital in Norway. Their research spans multiple fields within medicine, biochemistry, genetics, molecular biology, and neuroscience. They have contributed extensively to subfields such as genetics, psychiatry and mental health, cognitive neuroscience, molecular biology, and radiology, nuclear medicine, and imaging.

The scientist's work focuses on main topics including genetic associations and epidemiology, functional brain connectivity studies, advanced neuroimaging techniques and applications, schizophrenia research and treatment, bipolar disorder and treatment, tryptophan and brain disorders, and genetics and neurodevelopmental disorders.

Andreassen has published a substantial number of articles in various scientific venues. Frequent publication venues include:

bioRxiv (Cold Spring Harbor Laboratory)
Biological Psychiatry
Translational Psychiatry
Nature Communications
European Neuropsychopharmacology

Notable recent papers authored or co-authored by Ole A. Andreassen are:

ENIGMA and global neuroscience: A decade of large-scale studies of the brain in health and disease across more than 40 countries, 2020, Translational Psychiatry
Genome-wide analyses of ADHD identify 27 risk loci, refine the genetic architecture and implicate several cognitive domains, 2023, Nature Genetics
Within-sibship genome-wide association analyses decrease bias in estimates of direct genetic effects, 2022, Nature Genetics
Risk and protective factors for mental disorders beyond genetics: an evidence-based atlas, 2021, World Psychiatry
Brain aging in major depressive disorder: results from the ENIGMA major depressive disorder working group, 2020, Molecular Psychiatry

Frequent collaborators include:

Lars T. Westlye
Srdjan Djurovic
Oleksandr Frei
Alexey Shadrin
Anders M. Dale

Best Publications

Biological insights from 108 schizophrenia-associated genetic loci

Stephan Ripke;Stephan Ripke;Benjamin M. Neale;Benjamin M. Neale;Aiden Corvin;James T. R. Walters

7722
Citations
Variant of TREM2 associated with the risk of Alzheimer's disease

Thorlakur Jonsson;Hreinn Stefansson;Stacy Steinberg;Ingileif Jonsdottir

2860
Citations
Genome-wide association study identifies five new schizophrenia loci

Stephan Ripke;Alan R. Sanders;Kenneth S. Kendler;Douglas F. Levinson

2714
Citations
Genetic relationship between five psychiatric disorders estimated from genome-wide SNPs

S. Hong Lee;Stephan Ripke;Stephan Ripke;Benjamin M. Neale;Benjamin M. Neale;Stephen V. Faraone

2429
Citations
Genome-wide meta-analysis identifies new loci and functional pathways influencing Alzheimer's disease risk.

Iris E. Jansen;Jeanne E. Savage;Kyoko Watanabe;Julien Bryois

2416
Citations
Discovery of the first genome-wide significant risk loci for attention deficit/hyperactivity disorder

Ditte Demontis;Ditte Demontis;Raymond K Walters;Raymond K Walters;Joanna Martin;Joanna Martin;Joanna Martin;Manuel Mattheisen

2363
Citations
Identification of novel risk loci, causal insights, and heritable risk for Parkinson's disease: a meta-analysis of genome-wide association studies

Mike A Nalls;Cornelis Blauwendraat;Costanza L Vallerga;Karl Heilbron

2354
Citations
A mutation in APP protects against Alzheimer’s disease and age-related cognitive decline

Thorlakur Jonsson;Jasvinder K. Atwal;Stacy Steinberg;Jon Snaedal

2074
Citations
Large recurrent microdeletions associated with schizophrenia

Hreinn Stefansson;Dan Rujescu;Sven Cichon;Olli P. H. Pietilainen

2010
Citations
Analysis of shared heritability in common disorders of the brain

Verneri Anttila;Verneri Anttila;Brendan Bulik-Sullivan;Brendan Bulik-Sullivan;Hilary K. Finucane;Raymond K. Walters;Raymond K. Walters

1978
Citations
Common variants conferring risk of schizophrenia

Hreinn Stefansson;Hreinn Stefansson;Roel A. Ophoff;Roel A. Ophoff;Roel A. Ophoff;Stacy Steinberg;Stacy Steinberg;Ole A. Andreassen

1969
Citations
Common schizophrenia alleles are enriched in mutation-intolerant genes and in regions under strong background selection

Antonio F. Pardiñas;Peter Holmans;Andrew J. Pocklington;Valentina Escott-Price

1660
Citations
Genome-wide association study identifies 30 loci associated with bipolar disorder

Eli A. Stahl;Eli A. Stahl;Gerome Breen;Andreas J. Forstner;Andrew McQuillin

1637
Citations
Large-scale genome-wide association analysis of bipolar disorder identifies a new susceptibility locus near ODZ4

Pamela Sklar;Pamela Sklar;Stephan Ripke;Stephan Ripke;Laura J. Scott;Ole A. Andreassen

1524
Citations
Modeling Linkage Disequilibrium Increases Accuracy of Polygenic Risk Scores

Bjarni J. Vilhjálmsson;Jian Yang;Hilary K. Finucane;Alexander Gusev

1506
Citations
Genome-wide association meta-analysis in 269,867 individuals identifies new genetic and functional links to intelligence

Jeanne E Savage;Philip R Jansen;Philip R Jansen;Sven Stringer;Kyoko Watanabe

1409
Citations
Genomic Relationships, Novel Loci, and Pleiotropic Mechanisms across Eight Psychiatric Disorders

Phil H. Lee;Verneri Anttila;Hyejung Won;Yen-Chen A. Feng

1346
Citations
Subcortical brain volume abnormalities in 2028 individuals with schizophrenia and 2540 healthy controls via the ENIGMA consortium

T. G M van Erp;D. P. Hibar;J. M. Rasmussen;D. C. Glahn

1237
Citations
Mice Deficient in Cellular Glutathione Peroxidase Show Increased Vulnerability to Malonate, 3-Nitropropionic Acid, and 1-Methyl-4-Phenyl-1,2,5,6-Tetrahydropyridine

Peter Klivenyi;Ole A. Andreassen;Robert J. Ferrante;Alpaslan Dedeoglu

1103
Citations
A global overview of pleiotropy and genetic architecture in complex traits

Kyoko Watanabe;Sven Stringer;Oleksandr Frei;Maša Umićević Mirkov

1039
Citations

Frequent Co-Authors

Ingrid Melle University of Oslo

Srdjan Djurovic Oslo University Hospital

Ingrid Agartz University of Oslo

Lars T. Westlye University of Oslo

Anders M. Dale J. Craig Venter Institute

Thomas Werge University of Copenhagen

Erik G. Jönsson University of Oslo

Vidar M. Steen University of Bergen

Tobias Kaufmann University of Oslo

Kjetil Sundet University of Oslo

External Links

Personal website of Ole A. Andreassen

If you think any of the details on this page are incorrect, let us know.

Related Online Degrees & Career Pathways

Pursuing a career in medicine doesn’t always require the traditional route through medical school. There are a variety of online degrees and accelerated programs catering to different career goals within healthcare. For registered nurses, advancing your education has become more flexible with options such as the rn to bsn with no clinicals pathway. This allows working nurses to complete their BSN degree online, without the need for additional clinical hours.

For those interested in attaining the highest level of nursing practice, there are also the shortest dnp programs available online, helping advanced nurses achieve their Doctor of Nursing Practice faster. Some may opt for a dnp program without clinical hours, making it easier to balance work and study.

If you’re just starting your nursing journey or want to switch careers quickly, you might consider a fast lpn program that gets you licensed and into the workforce in less time. These online learning opportunities provide increased accessibility, flexibility, and the chance to accelerate your healthcare career—even from home.