World's Best Scientists 2026 revealed!

D-Index & Metrics

Medicine

D-Index
85
Citations
22098
World Ranking
14759
National Ranking
7460

Ronald M. Harper 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 Ronald M. Harper 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: 405 publications — 39th percentile

39% of scientists in this discipline score the same or lower.

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

Ronald M. Harper 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 Ronald M. Harper 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: 85 D-Index — 29th percentile

29% of scientists in this discipline score the same or lower.

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

Overview

Ronald M. Harper is affiliated with the University of California, Los Angeles in the United States. Their research spans multiple aspects of medicine and neuroscience, with a particular focus on epilepsy, respiration, and sleep disorders.

Their main fields of study include:

  • Medicine
  • Neuroscience

Within these fields, they have contributed extensively to several subfields such as:

  • Psychiatry and Mental Health
  • Endocrine and Autonomic Systems
  • Cognitive Neuroscience
  • Pediatrics, Perinatology and Child Health
  • Physiology

The primary topics of their work cover a wide range of specialized research areas, including:

  • Epilepsy research and treatment
  • Neuroscience of respiration and sleep
  • Obstructive Sleep Apnea Research
  • Neonatal and fetal brain pathology
  • Heart Rate Variability and Autonomic Control
  • Advanced Neuroimaging Techniques and Applications
  • EEG and Brain-Computer Interfaces

Harper's recent publications illustrate a focus on epilepsy and its neurological impacts. Some of their recent papers are:

  • "Peri-ictal hypoxia is related to extent of regional brain volume loss accompanying generalized tonic-clonic seizures," 2020, Epilepsia
  • "Association of Peri-ictal Brainstem Posturing With Seizure Severity and Breathing Compromise in Patients With Generalized Convulsive Seizures," 2020, Neurology
  • "Seizure Clusters, Seizure Severity Markers, and SUDEP Risk," 2021, Frontiers in Neurology
  • "Distinct Patterns of Brain Metabolism in Patients at Risk of Sudden Unexpected Death in Epilepsy," 2021, Frontiers in Neurology
  • "Altered amygdala volumes and microstructure in focal epilepsy patients with tonic-clonic seizures, ictal, and post-convulsive central apnea," 2023, Epilepsia

The venues where Harper frequently publishes further indicate their research focus and academic network. Key publication venues include:

  • bioRxiv (Cold Spring Harbor Laboratory)
  • Frontiers in Neurology
  • PLoS ONE
  • SLEEP
  • Epilepsia

Collaborations with other researchers play a significant role in Harper's work. Frequent co-authors include:

  • Beate Diehl
  • Catherine Scott
  • Jennifer A. Ogren
  • Samden Lhatoo
  • Luke A. Allen

Best Publications

  • Dorsal raphe neurons: depression of firing during sleep in cats.

    Dennis J. McGinty;Ronald M. Harper

  • Brain Morphology Associated with Obstructive Sleep Apnea

    Paul M. Macey;Luke A. Henderson;Katherine E. Macey;Jeffry R. Alger

  • Patterns of beat-to-beat heart rate variability in advanced heart failure

    Mary A. Woo;William G. Stevenson;Debra K. Moser;Robert B. Trelease

  • The Human Tongue during Sleep: Electromyographic Activity of the -Genioglossus Muscle

    E.K. Sauerland;E.K. Sauerland;E.K. Sauerland;R.M. Harper;R.M. Harper;R.M. Harper

  • A method for removal of global effects from fMRI time series.

    Paul M Macey;Katherine E Macey;Rajesh Kumar;Ronald M Harper

  • Brain structural changes in obstructive sleep apnea.

    Paul M. Macey;Rajesh Kumar;Mary A. Woo;Edwin M. Valladares

  • Cerebral Vasomotion: A 0.1-Hz Oscillation in Reflected Light Imaging of Neural Activity

    J E Mayhew;S Askew;Y Zheng;J Porrill

  • RMSSD, a measure of vagus-mediated heart rate variability, is associated with risk factors for SUDEP: The SUDEP-7 Inventory

    Christopher M. DeGiorgio;Patrick Miller;Sheba Meymandi;Alex Chin

  • Clinical neurocardiology defining the value of neuroscience-based cardiovascular therapeutics

    Kalyanam Shivkumar;Olujimi A. Ajijola;Inder Anand;J. Andrew Armour

  • Regional brain gray matter loss in heart failure.

    Mary A. Woo;Paul M. Macey;Gregg C. Fonarow;Michele A. Hamilton

  • Dynamic analysis of cardiac R-R intervals in normal infants and in infants who subsequently succumbed to the sudden infant death syndrome.

    V L Schechtman;S L Raetz;R K Harper;A Garfinkel

  • Lateralized and widespread brain activation during transient blood pressure elevation revealed by magnetic resonance imaging.

    Ronald M. Harper;Richard Bandler;David Spriggs;Jeffry R. Alger

  • Relationship between obstructive sleep apnea severity and sleep, depression and anxiety symptoms in newly-diagnosed patients.

    Paul M. Macey;Mary A. Woo;Rajesh Kumar;Rebecca L. Cross

  • Polygraphic Studies of Normal Infants During the First Six Months of Life: III. Incidence of Apnea and Periodic Breathing

    Toke Hoppenbrouwers;Joan E. Hodgman;R. M. Harper;Elvira Hofmann

  • Heart rate variability in congenital central hypoventilation syndrome

    Marlyn S Woo;Mary A Woo;David Gozal;Mary T Jansen

  • Polygraphic studies of normal infants during the first six months of life. I. Heart rate and variability as a function of state.

    R M Harper;Toke Hoppenbrouwers;M B Sterman;D J Mcginty

  • Brain injury in autonomic, emotional, and cognitive regulatory areas in patients with heart failure.

    Mary A. Woo;Rajesh Kumar;Paul M. Macey;Gregg C. Fonarow

  • State-dependent alteration of respiratory cycle timing by stimulation of the central nucleus of the amygdala

    R.M. Harper;R.C. Frysinger;R.B. Trelease;J.D. Marks

  • Heart rate variability in children with obstructive sleep apnea.

    Gabriel Aljadeff;David Gozal;David Gozal;Vicki L. Schechtman;Brian Burrell

  • Sleep influences on homeostatic functions: implications for sudden infant death syndrome.

    Ronald M Harper;Hannah C Kinney;Peter J Fleming;Bradley T Thach

Frequent Co-Authors

Gregg C. Fonarow
Gregg C. Fonarow University of California, Los Angeles
Luke A. Henderson
Luke A. Henderson University of Sydney
Beate Diehl
Beate Diehl University College London
Jeffry R. Alger
Jeffry R. Alger University of California, Los Angeles
Dennis McGinty
Dennis McGinty University of California, Los Angeles
Gary C. Sieck
Gary C. Sieck Mayo Clinic
Samden D. Lhatoo
Samden D. Lhatoo The University of Texas Health Science Center at Houston
Maromi Nei
Maromi Nei Thomas Jefferson University
Stephan U. Schuele
Stephan U. Schuele Northwestern University
George B. Richerson
George B. Richerson University of Iowa

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