The chart shows the distribution of publications by all Research.com ranked scientists in the field of Psychology in 2026. The highlighted bar marks where Nikolai Olavi Czajkowski sits on this spectrum.
This scientist: 155 publications — 52nd percentile
52% of scientists in this discipline score the same or lower.
The last bar groups every scientist with 705 publications or more.
The chart shows the D-index (discipline H-index) distribution of Psychology scientists ranked by Research.com in 2026. The highlighted bar marks where Nikolai Olavi Czajkowski sits on this spectrum.
This scientist: 33 D-Index — 10th percentile
10% of scientists in this discipline score the same or lower.
The last bar groups every scientist with 144 D-Index or more.
Nikolai Olavi Czajkowski is affiliated with the University of Oslo in Norway and has contributed extensively to the field of psychology, with a focus on clinical and social psychology. Their research spans a variety of subfields, including clinical psychology, social psychology, experimental and cognitive psychology, cognitive neuroscience, and psychiatry and mental health.
Their work addresses multiple topics relevant to mental health and psychosocial development. Key areas of research include child and adolescent psychosocial and emotional development, attachment and relationship dynamics, mental health research topics, suicide and self-harm studies, maternal mental health during pregnancy and postpartum, personality disorders and psychopathology, as well as health disparities and outcomes.
Frequent coauthors collaborating with Nikolai Olavi Czajkowski include Espen Røysamb, Ragnhild Bang Nes, Eivind Ystrøm, Olav Vassend, and Erling W. Rognli. These collaborations reflect a consistent engagement with peers in their specialized fields.
Notable publication venues featuring their work are Research Square, Frontiers in Psychiatry, bioRxiv (Cold Spring Harbor Laboratory), Journal of Child and Family Studies, and Current Psychology.
Christopher S. Nielsen;Audun Stubhaug;Donald D. Price;Olav Vassend
Kenneth S. Kendler;Steven H. Aggen;Nikolai Czajkowski;Espen Røysamb
S. Torgersen;N. Czajkowski;K. Jacobson;T. Reichborn-Kjennerud
Ted Reichborn-Kjennerud;Nikolai Czajkowski;Svenn Torgersen;Michael C. Neale
Guido Biele;Kristin Gustavson;Nikolai Olavi Czajkowski;Roy Miodini Nilsen
Ragnhild B. Nes;Nikolai O. Czajkowski;Nikolai O. Czajkowski;Espen Røysamb;Espen Røysamb;Ragnhild E. Ørstavik
Ted Reichborn-Kjennerud;Nikolai Czajkowski;Michael C. Neale;Ragnhild E. Ørstavik
Espen Røysamb;Ragnhild Bang Nes;Ragnhild Bang Nes;Nikolai Olavi Czajkowski;Nikolai Olavi Czajkowski;Olav Vassend
Ted Reichborn-Kjennerud;Ted Reichborn-Kjennerud;Eivind Ystrom;Michael C. Neale;Steven H. Aggen
T. Reichborn-Kjennerud;N. Czajkowski;E. Røysamb;R. E. Ørstavik
T. Reichborn-Kjennerud;N. Czajkowski;E. Ystrøm;R. Ørstavik
Elise Tornare;Nikolai O. Czajkowski;Nikolai O. Czajkowski;Francisco Pons
Thomas Haarklau Kleppestø;Nikolai Olavi Czajkowski;Nikolai Olavi Czajkowski;Olav Vassend;Espen Røysamb;Espen Røysamb
Yngvild Bjartveit Haukeland;Nikolai Olavi Czajkowski;Krister Westlye Fjermestad;Wendy K. Silverman
Ellen Kvestad;Nikolai Czajkowski;Bo Engdahl;Howard J. Hoffman
Tom Henrik Rosenström;Tom Henrik Rosenström;Line C. Gjerde;Line C. Gjerde;Robert Frederick Krueger;Steven H. Aggen
Olav Vassend;Espen Røysamb;Espen Røysamb;Christopher Sivert Nielsen;Christopher Sivert Nielsen;Nikolai Olavi Czajkowski;Nikolai Olavi Czajkowski
Unknown
Kristian Amundsen Østby;Nikolai Czajkowski;Nikolai Czajkowski;Gun Peggy Knudsen;Eivind Ystrom
Espen Moen Eilertsen;Line C. Gjerde;Ted Reichborn-Kjennerud;Ted Reichborn-Kjennerud;Ragnhild Ørstavik
Susie Fu;Susie Fu;Nikolai Olavi Czajkowski;Nikolai Olavi Czajkowski;Bjørn Rishovd Rund;Bjørn Rishovd Rund;Anne-Kari Torgalsbøen
Ragnhild E Ørstavik;Kenneth S Kendler;Nikolai Czajkowski;Kristian Tambs
If you think any of the details on this page are incorrect, let us know.
Exploring a degree in psychology can open doors to a range of rewarding career pathways, especially in the mental health field. Many students pursue online degrees for added flexibility and the opportunity to specialize in areas such as counseling or clinical psychology.
If you are considering a counseling career, it’s important to understand that certification and licensure requirements can vary based on location. For instance, if you plan to work in New Jersey, you’ll need to meet the Jersey City mental health counselor certification requirements. Those interested in working in Kansas City should review the specific steps on how to become a mental health counselor in Kansas City.
Similarly, requirements can differ in Texas and Nevada. You can read more about mental health counselor requirements in Laredo and learn how to become a mental health counselor in Las Vegas to better prepare for licensure in these areas.
Whichever city or state you choose, researching local regulations while you study online will help you plan your academic path and achieve your career goals in psychology.
Yanshan University
Tohoku University
Columbia University
University of Hong Kong
Columbia University
Michigan State University
Temple University
Zhejiang University
French Research Institute for Exploitation of the Sea
University of Barcelona
Jacobs University
Vanderbilt University Medical Center
University of Toronto
South China University of Technology
Mayo Clinic
University of Paris-Saclay
