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Christopher M. Callahan

Christopher M. Callahan

Indiana University
United States

D-Index & Metrics

Medicine

D-Index
77
Citations
26075
World Ranking
18318
National Ranking
9142

Christopher M. Callahan publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Christopher M. Callahan sits on this spectrum.

101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 611 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101 publications 1,796+

This scientist: 240 publications — 7th percentile

7% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

Christopher M. Callahan D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Christopher M. Callahan sits on this spectrum.

70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 400 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70 D-Index 217+

This scientist: 77 D-Index — 10th percentile

10% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

Overview

Christopher M. Callahan is affiliated with Indiana University in the United States. Their research spans multiple fields within medicine and health professions, with a notable focus on dementia and cognitive impairment, geriatric care, and palliative care.

The scientist's primary fields of study include Medicine, with 37 publications, and Health Professions, with 19 publications. Subfields prominently represented in their work cover General Health Professions, Public Health, Environmental and Occupational Health, Psychiatry and Mental Health, Cardiology and Cardiovascular Medicine, and Economics and Econometrics.

Main topics of their research include:

  • Dementia and Cognitive Impairment Research
  • Palliative Care and End-of-Life Issues
  • Geriatric Care and Nursing Homes
  • Health Systems, Economic Evaluations, Quality of Life
  • Chronic Disease Management Strategies
  • Pharmaceutical Practices and Patient Outcomes
  • Blood Pressure and Hypertension Studies

Recent papers authored or co-authored by Christopher M. Callahan demonstrate a focus on dementia care, behavioral interventions for older adults, and cardiovascular biomarkers related to depression. Notable publications include:

  • Dementia care navigation: Building toward a common definition, key principles, and outcomes (2023), Alzheimer's & Dementia Translational Research & Clinical Interventions
  • Multicomponent behavioral intervention to reduce exposure to anticholinergics in primary care older adults (2021), Journal of the American Geriatrics Society
  • Novel Markers of Angiogenesis in the Setting of Cognitive Impairment and Dementia (2020), Journal of Alzheimer's Disease
  • Complex Transitions from Skilled Nursing Facility to Home: Patient and Caregiver Perspectives (2020), Journal of General Internal Medicine
  • Effect of modernized collaborative care for depression on depressive symptoms and cardiovascular disease risk biomarkers: eIMPACT randomized controlled trial (2023), Brain Behavior and Immunity

Their frequent collaborators include Daniel O. Clark, Malaz Boustani, Alexia M. Torke, Jesse C. Stewart, and John I. Nürnberger. Publication venues where Christopher M. Callahan's work appears most often include:

  • Journal of the American Geriatrics Society (6 publications)
  • Journal of General Internal Medicine (2 publications)
  • JAMA Internal Medicine (2 publications)
  • SSRN Electronic Journal (2 publications)
  • Innovation in Aging (2 publications)

In addition to journal articles, Christopher M. Callahan has contributed to book publications, such as the volume published by University of Lodz Press titled Łódzkie festiwale teatralne. Historia i współczesność (2021).

Best Publications

  • Collaborative Care Management of Late-Life Depression in the Primary Care Setting: A Randomized Controlled Trial

    Jürgen Unützer;Wayne Katon;Christopher M. Callahan;John W. Williams

  • Six-item screener to identify cognitive impairment among potential subjects for clinical research.

    Christopher M. Callahan;Frederick W. Unverzagt;Siu L. Hui;Anthony J. Perkins

  • Monitoring depression treatment outcomes with the Patient Health Questionnaire-9

    Bernd Löwe;Jürgen Unützer;Christopher M Callahan;Anthony J Perkins

  • Effectiveness of collaborative care for older adults with Alzheimer disease in primary care: a randomized controlled trial.

    Christopher M. Callahan;Malaz A. Boustani;Frederick W. Unverzagt;Mary G. Austrom

  • Geriatric care management for low-income seniors: a randomized controlled trial.

    Steven R. Counsell;Christopher M. Callahan;Daniel O. Clark;Wanzhu Tu

  • Patient Outcomes Following Tricompartmental Total Knee Replacement: A Meta-analysis

    Christopher M. Callahan;Brenda G. Drake;David A. Heck;Robert S. Dittus;Robert S. Dittus

  • Depression and Bipolar Support Alliance consensus statement on the unmet needs in diagnosis and treatment of mood disorders in late life.

    Dennis S. Charney;Charles F. Reynolds;Lydia Lewis;Barry D. Lebowitz

  • Common comorbidity scales were similar in their ability to predict health care costs and mortality.

    Anthony J. Perkins;Kurt Kroenke;Jürgen Unützer;Wayne Katon

  • Longitudinal Study of Depression and Health Services Use Among Elderly Primary Care Patients

    Christopher M. Callahan;Christopher M. Callahan;Siu L. Hui;Siu L. Hui;Nancy A. Nienaber;Beverly S. Musick;Beverly S. Musick

  • Improving treatment of late life depression in primary care: a randomized clinical trial.

    Christopher M. Callahan;Hugh C. Hendrie;Robert S. Dittus;D. Craig Brater

  • Implementing a screening and diagnosis program for dementia in primary care.

    Malaz Boustani;Christopher M. Callahan;Christopher M. Callahan;Frederick W. Unverzagt;Mary G. Austrom

  • Comorbidity profile of dementia patients in primary care: are they sicker?

    Cathy C. Schubert;Malaz Boustani;Christopher M. Callahan;Anthony J. Perkins

  • The Risk of Nursing Home Placement and Subsequent Death Among Older Adults

    Fredric D. Wolinsky;Christopher M. Callahan;Christopher M. Callahan;John F. Fitzgerald;John F. Fitzgerald;John F. Fitzgerald;Robert J. Johnson

  • Improving primary care for depression in late life: the design of a multicenter randomized trial.

    Jürgen Unützer;Wayne Katon;John W. Williams;Christopher M. Callahan

  • Association of Antioxidants with Memory in a Multiethnic Elderly Sample Using the Third National Health and Nutrition Examination Survey

    Anthony J. Perkins;Hugh C. Hendrie;Christopher M. Callahan;Christopher M. Callahan;Sujuan Gao

  • Changes in functional status and the risks of subsequent nursing home placement and death.

    F. D. Wolinsky;Christopher Callahan;J. F. Fitzgerald;R. J. Johnson

  • Cost-effectiveness of improving primary care treatment of late-life depression.

    Wayne J. Katon;Michael Schoenbaum;Ming Yu Fan;Christopher M. Callahan

  • Outcomes of percutaneous endoscopic gastrostomy among older adults in a community setting

    Christopher M. Callahan;Kathy M. Haag;Morris Weinberger;Morris Weinberger;Morris Weinberger;William M. Tierney;William M. Tierney;William M. Tierney

  • Oral corticosteroid therapy for patients with stable chronic obstructive pulmonary disease. A meta-analysis.

    Christopher M. Callahan;Robert S. Dittus;Barry P. Katz

  • Accuracy of self-reported health services use and patterns of care among urban older adults.

    Daniel B. Wallihan;Timothy E. Stump;Timothy E. Stump;Christopher M. Callahan

Frequent Co-Authors

Hugh C. Hendrie
Hugh C. Hendrie Indiana University
Malaz Boustani
Malaz Boustani Indiana University
William M. Tierney
William M. Tierney The University of Texas at Austin
Frederick W. Unverzagt
Frederick W. Unverzagt Indiana University
Fredric D. Wolinsky
Fredric D. Wolinsky University of Iowa
Kurt Kroenke
Kurt Kroenke Indiana University
John W Williams
John W Williams Duke University
Robert S. Dittus
Robert S. Dittus Vanderbilt University Medical Center
Clement J. McDonald
Clement J. McDonald National Institutes of Health
Wayne Katon
Wayne Katon University of Washington

External Links

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Best Scientists Citing Christopher M. Callahan

Kurt Kroenke

Kurt Kroenke

Indiana University

Publications: 143

Jürgen Unützer

Jürgen Unützer

University of Washington

Publications: 128

Malaz Boustani

Malaz Boustani

Indiana University

Publications: 102

Wayne Katon

Wayne Katon

University of Washington

Publications: 91

Martha L. Bruce

Martha L. Bruce

Dartmouth College

Publications: 81

Charles F. Reynolds

Charles F. Reynolds

University of Pittsburgh

Publications: 77

Kenneth B. Wells

Kenneth B. Wells

University of California, Los Angeles

Publications: 59

Patricia A. Areán

Patricia A. Areán

University of Washington

Publications: 53

Yeates Conwell

Yeates Conwell

University of Rochester Medical Center

Publications: 51

Mark E. Kunik

Mark E. Kunik

Baylor College of Medicine

Publications: 48

Fredric D. Wolinsky

Fredric D. Wolinsky

University of Iowa

Publications: 45

David W. Oslin

David W. Oslin

University of Pennsylvania

Publications: 45

Benoit H. Mulsant

Benoit H. Mulsant

Centre for Addiction and Mental Health

Publications: 44

Simon Gilbody

Simon Gilbody

University of York

Publications: 43

Cathy D. Sherbourne

Cathy D. Sherbourne

RAND Corporation

Publications: 42

David B. Reuben

David B. Reuben

University of California, Los Angeles

Publications: 41

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