World's Best Scientists 2026 revealed!
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Ozioma C. Okonkwo

D-Index & Metrics

Psychology

D-Index
65
Citations
12582
World Ranking
2874
National Ranking
1655

Neuroscience

D-Index
67
Citations
15868
World Ranking
2889
National Ranking
1341

Ozioma C. Okonkwo publication distribution in Psychology in 2026

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 Ozioma C. Okonkwo sits on this spectrum.

31–40 publications: 6 scientists 41–50 publications: 52 scientists 51–60 publications: 138 scientists 61–70 publications: 299 scientists 71–80 publications: 461 scientists 81–90 publications: 605 scientists 91–100 publications: 713 scientists 101–110 publications: 736 scientists 111–120 publications: 686 scientists 121–130 publications: 670 scientists 131–140 publications: 644 scientists 141–150 publications: 597 scientists 151–160 publications: 576 scientists 161–170 publications: 477 scientists 171–180 publications: 450 scientists 181–190 publications: 397 scientists 191–200 publications: 343 scientists 201–210 publications: 328 scientists 211–220 publications: 313 scientists 221–230 publications: 283 scientists 231–240 publications: 226 scientists 241–250 publications: 196 scientists 251–260 publications: 201 scientists 261–270 publications: 171 scientists 271–280 publications: 151 scientists 281–290 publications: 139 scientists 291–300 publications: 113 scientists 301–310 publications: 102 scientists 311–320 publications: 100 scientists 321–330 publications: 76 scientists 331–340 publications: 92 scientists 341–350 publications: 85 scientists 351–360 publications: 69 scientists 361–370 publications: 71 scientists 371–380 publications: 63 scientists 381–390 publications: 58 scientists 391–400 publications: 57 scientists 401–410 publications: 43 scientists 411–420 publications: 33 scientists 421–430 publications: 50 scientists 431–440 publications: 41 scientists 441–450 publications: 32 scientists 451–460 publications: 27 scientists 461–470 publications: 28 scientists 471–480 publications: 25 scientists 481–490 publications: 28 scientists 491–500 publications: 20 scientists 501–510 publications: 23 scientists 511–520 publications: 26 scientists 521–530 publications: 17 scientists 531–540 publications: 21 scientists 541–550 publications: 14 scientists 551–560 publications: 16 scientists 561–570 publications: 10 scientists 571–580 publications: 22 scientists 581–590 publications: 9 scientists 591–600 publications: 14 scientists 601–610 publications: 9 scientists 611–620 publications: 11 scientists 621–630 publications: 4 scientists 631–640 publications: 7 scientists 641–650 publications: 5 scientists 651–660 publications: 10 scientists 661–670 publications: 8 scientists 671–680 publications: 8 scientists 681–690 publications: 4 scientists 691–700 publications: 3 scientists 701–704 publications: 4 scientists 705+ publications: 100 scientists
31 publications 705+

This scientist: 257 publications — 82nd percentile

82% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 705 publications or more.

Ozioma C. Okonkwo D-index placement in Psychology in 2026

The chart shows the D-index (discipline H-index) distribution of Psychology scientists ranked by Research.com in 2026. The highlighted bar marks where Ozioma C. Okonkwo sits on this spectrum.

30–31 D-Index: 398 scientists 32–33 D-Index: 702 scientists 34–35 D-Index: 671 scientists 36–37 D-Index: 659 scientists 38–39 D-Index: 641 scientists 40–41 D-Index: 671 scientists 42–43 D-Index: 617 scientists 44–45 D-Index: 558 scientists 46–47 D-Index: 495 scientists 48–49 D-Index: 487 scientists 50–51 D-Index: 445 scientists 52–53 D-Index: 390 scientists 54–55 D-Index: 408 scientists 56–57 D-Index: 345 scientists 58–59 D-Index: 325 scientists 60–61 D-Index: 321 scientists 62–63 D-Index: 248 scientists 64–65 D-Index: 290 scientists 66–67 D-Index: 218 scientists 68–69 D-Index: 219 scientists 70–71 D-Index: 215 scientists 72–73 D-Index: 183 scientists 74–75 D-Index: 169 scientists 76–77 D-Index: 132 scientists 78–79 D-Index: 137 scientists 80–81 D-Index: 120 scientists 82–83 D-Index: 112 scientists 84–85 D-Index: 86 scientists 86–87 D-Index: 101 scientists 88–89 D-Index: 83 scientists 90–91 D-Index: 77 scientists 92–93 D-Index: 70 scientists 94–95 D-Index: 78 scientists 96–97 D-Index: 58 scientists 98–99 D-Index: 53 scientists 100–101 D-Index: 57 scientists 102–103 D-Index: 48 scientists 104–105 D-Index: 53 scientists 106–107 D-Index: 46 scientists 108–109 D-Index: 24 scientists 110–111 D-Index: 35 scientists 112–113 D-Index: 27 scientists 114–115 D-Index: 32 scientists 116–117 D-Index: 31 scientists 118–119 D-Index: 22 scientists 120–121 D-Index: 16 scientists 122–123 D-Index: 24 scientists 124–125 D-Index: 18 scientists 126–127 D-Index: 11 scientists 128–129 D-Index: 19 scientists 130–131 D-Index: 10 scientists 132–133 D-Index: 16 scientists 134–135 D-Index: 10 scientists 136–137 D-Index: 12 scientists 138–139 D-Index: 8 scientists 140–141 D-Index: 5 scientists 142–143 D-Index: 12 scientists 144+ D-Index: 98 scientists
30 D-Index 144+

This scientist: 65 D-Index — 76th percentile

76% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 144 D-Index or more.

Overview

Ozioma C. Okonkwo is affiliated with the University of Wisconsin-Madison in the United States, with a primary research focus in the field of Medicine. Their work spans several subfields including Psychiatry and Mental Health, Physiology, Neurology, Cognitive Neuroscience, and Cardiology and Cardiovascular Medicine.

Their research covers multiple main topics, such as:

  • Dementia and Cognitive Impairment Research
  • Alzheimer's disease research and treatments
  • Functional Brain Connectivity Studies
  • Health, Environment, Cognitive Aging
  • Frailty in Older Adults
  • Advanced Neuroimaging Techniques and Applications
  • Health disparities and outcomes

Ozioma C. Okonkwo has contributed to a variety of recent papers, including:

  • "Revised criteria for diagnosis and staging of Alzheimer's disease: Alzheimer's Association Workgroup," 2024, Alzheimer s & Dementia
  • "Using the Alzheimer's Disease Neuroimaging Initiative to improve early detection, diagnosis, and treatment of Alzheimer's disease," 2021, Alzheimer s & Dementia
  • "An examination of a novel multipanel of CSF biomarkers in the Alzheimer's disease clinical and pathological continuum," 2020, Alzheimer s & Dementia
  • "Association of Neighborhood-Level Disadvantage With Cerebral and Hippocampal Volume," 2020, JAMA Neurology
  • "Effects of Aerobic Exercise Training on Systemic Biomarkers and Cognition in Late Middle-Aged Adults at Risk for Alzheimer's Disease," 2021, Frontiers in Endocrinology

The scientist frequently publishes in venues such as:

  • Alzheimer s & Dementia
  • Alzheimer s & Dementia Diagnosis Assessment & Disease Monitoring
  • Journal of Alzheimer s Disease
  • JAMA Neurology
  • SLEEP

Collaborations are notable with frequent co-authors including:

  • Sterling C. Johnson
  • Barbara B. Bendlin
  • Sanjay Asthana
  • Cynthia M. Carlsson
  • Henrik Zetterberg

Best Publications

  • Whitepaper: Defining and investigating cognitive reserve, brain reserve, and brain maintenance

    Yaakov Stern;Eider M. Arenaza-Urquijo;David Bartrés-Faz;Sylvie Belleville

  • Association of Insulin Resistance With Cerebral Glucose Uptake in Late Middle–Aged Adults at Risk for Alzheimer Disease

    Auriel A. Willette;Barbara B. Bendlin;Erika J. Starks;Alex C. Birdsill

  • The Wisconsin Registry for Alzheimer's Prevention: A review of findings and current directions.

    Sterling C. Johnson;Rebecca L. Koscik;Erin M. Jonaitis;Lindsay R. Clark

  • Physical activity attenuates age-related biomarker alterations in preclinical AD

    Ozioma C. Okonkwo;Stephanie A. Schultz;Jennifer M. Oh;Jordan Larson

  • Amyloid burden is associated with self-reported sleep in nondemented late middle-aged adults

    Kate E. Sprecher;Barbara B. Bendlin;Annie M. Racine;Ozioma C. Okonkwo

  • Fornix integrity and hippocampal volume predict memory decline and progression to Alzheimer’s disease

    Michelle M. Mielke;Ozioma C. Okonkwo;Kenichi Oishi;Susumu Mori;Susumu Mori

  • Declining financial capacity in mild cognitive impairment: A 1-year longitudinal study

    K. L. Triebel;R. Martin;H. R. Griffith;J. Marceaux

  • Poor sleep is associated with CSF biomarkers of amyloid pathology in cognitively normal adults.

    Kate E. Sprecher;Rebecca L. Koscik;Cynthia M. Carlsson;Henrik Zetterberg

  • Amyloid burden and neural function in people at risk for Alzheimer's Disease

    Sterling C. Johnson;Bradley T. Christian;Ozioma C. Okonkwo;Jennifer M. Oh

  • Mild cognitive impairment and everyday function: evidence of reduced speed in performing instrumental activities of daily living.

    Virginia G. Wadley;Ozioma Okonkwo;Michael Crowe;Lesley A. Ross-Meadows;Lesley A. Ross-Meadows

  • Mild Cognitive Impairment and Everyday Function: An Investigation of Driving Performance

    Virginia G. Wadley;Ozioma Okonkwo;Michael Crowe;David E. Vance

  • Medical decision-making capacity in patients with mild cognitive impairment

    O. Okonkwo;H. R. Griffith;K. Belue;S. Lanza

  • Cognitive correlates of financial abilities in mild cognitive impairment.

    Ozioma C. Okonkwo;Virginia G. Wadley;H. Randall Griffith;Karlene Ball

  • Using the Alzheimer's Disease Neuroimaging Initiative to improve early detection, diagnosis, and treatment of Alzheimer's disease.

    Dallas P. Veitch;Michael W. Weiner;Paul S. Aisen;Laurel A. Beckett

  • Low cerebral blood flow is associated with lower memory function in metabolic syndrome.

    Alex C. Birdsill;Cynthia M. Carlsson;Auriel A. Willette;Ozioma C. Okonkwo

  • Life-Space and Cognitive Decline in a Community-Based Sample of African American and Caucasian Older Adults

    Michael Crowe;Ross Andel;Virginia G. Wadley;Ozioma C. Okonkwo

  • Occupational Complexity and Cognitive Reserve in a Middle-Aged Cohort at Risk for Alzheimer's Disease

    Elizabeth A. Boots;Stephanie A. Schultz;Rodrigo P. Almeida;Jennifer M. Oh

  • Associations between white matter microstructure and amyloid burden in preclinical Alzheimer's disease: A multimodal imaging investigation

    Annie M. Racine;Nagesh Adluru;Andrew L. Alexander;Bradley T. Christian

  • Pathway-Specific Polygenic Risk Scores as Predictors of Amyloid-β Deposition and Cognitive Function in a Sample at Increased Risk for Alzheimer's Disease.

    Burcu F Darst;Rebecca L Koscik;Annie M Racine;Jennifer M Oh

  • Regional white matter hyperintensities: aging, Alzheimer's disease risk, and cognitive function

    Alex C. Birdsill;Rebecca L. Koscik;Erin M. Jonaitis;Sterling C. Johnson

  • Association of Neighborhood-Level Disadvantage With Cerebral and Hippocampal Volume.

    Jack F V Hunt;William Buckingham;Alice J Kim;Jennifer Oh

  • Medical decision-making capacity in mild cognitive impairment: A 3-year longitudinal study

    O. C. Okonkwo;H. R. Griffith;J. N. Copeland;K. Belue

  • Awareness of deficits in financial abilities in patients with mild cognitive impairment: going beyond self-informant discrepancy.

    Ozioma C. Okonkwo;Virginia G. Wadley;H Randall Griffith;Katherine Belue

Frequent Co-Authors

Sterling C. Johnson
Sterling C. Johnson University of Wisconsin–Madison
Sanjay Asthana
Sanjay Asthana University of Wisconsin–Madison
Mark A. Sager
Mark A. Sager University of Wisconsin–Madison
Rebecca L. Koscik
Rebecca L. Koscik University of Wisconsin–Madison
Henrik Zetterberg
Henrik Zetterberg University of Gothenburg
Bruce P. Hermann
Bruce P. Hermann University of Wisconsin–Madison
Kaj Blennow
Kaj Blennow University of Gothenburg
Andrew L. Alexander
Andrew L. Alexander University of Wisconsin–Madison
Bradley T. Christian
Bradley T. Christian University of Wisconsin–Madison
Daniel C. Marson
Daniel C. Marson University of Alabama at Birmingham

External Links

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Related Online Degrees & Career Pathways

If you’re interested in studying psychology, you might also consider related fields like social work, counseling, or human services. Online degree programs in social work provide flexible options for students who need to balance education with work or family commitments.

Many universities now offer quality online pathways tailored to prepare graduates for diverse roles in mental health, community support, and advocacy. For students interested in a specific region, it’s helpful to compare programs based on location and specialization. For instance, the best online social work degree programs in Massachusetts and the best online social work degrees in the Northeast offer programs designed for different career goals.

Exploring regional options can help you find the right fit. You may want to look into the best online social work degrees in New Hampshire and the best online social work degrees in Ohio, which both highlight leading programs with strong academic reputations and accessible coursework.

These related online degrees open doors to rewarding careers in counseling, case management, research, and more—complementing studies in psychology and expanding your professional opportunities.

Best Scientists Citing Ozioma C. Okonkwo

Sterling C. Johnson

Sterling C. Johnson

University of Wisconsin–Madison

Publications: 103

Kaj Blennow

Kaj Blennow

University of Gothenburg

Publications: 86

Henrik Zetterberg

Henrik Zetterberg

University of Gothenburg

Publications: 72

Rebecca L. Koscik

Rebecca L. Koscik

University of Wisconsin–Madison

Publications: 51

Daniel C. Marson

Daniel C. Marson

University of Alabama at Birmingham

Publications: 42

Sanjay Asthana

Sanjay Asthana

University of Wisconsin–Madison

Publications: 41

Reisa A. Sperling

Reisa A. Sperling

Brigham and Women's Hospital

Publications: 37

John C. Morris

John C. Morris

Washington University in St. Louis

Publications: 33

Michael W. Weiner

Michael W. Weiner

University of California, San Francisco

Publications: 30

Harald Hampel

Harald Hampel

Eisai (United States)

Publications: 27

Ronald C. Petersen

Ronald C. Petersen

University of Pennsylvania

Publications: 26

David S. Knopman

David S. Knopman

Mayo Clinic

Publications: 26

Diane J. Cook

Diane J. Cook

Washington State University

Publications: 25

José Luis Molinuevo

José Luis Molinuevo

Beta

Publications: 25

Clifford R. Jack

Clifford R. Jack

Mayo Clinic

Publications: 24

William J. Jagust

William J. Jagust

University of California, Berkeley

Publications: 23

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