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D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Medicine 78 18036 8988 332 22552

Kenneth J. Ryan publications per year

The chart shows the history of publications by Kenneth J. Ryan between 1953 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kenneth J. Ryan published across 74 years, from 1953 to 2026, averaging 5 papers a year. Output peaked at 23 publications in 1980. 6 of the 367 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1953 to 2026. Vertical axis: number of publications, 0 to 23. Peak 23 publications in 1980. 1953: 2 publications 1954: 0 publications 1955: 0 publications 1956: 2 publications 1957: 1 publication 1958: 2 publications 1959: 2 publications 1960: 1 publication 1961: 8 publications 1962: 3 publications 1963: 4 publications 1964: 5 publications 1965: 2 publications 1966: 5 publications 1967: 7 publications 1968: 3 publications 1969: 8 publications 1970: 9 publications 1971: 6 publications 1972: 11 publications 1973: 11 publications 1974: 15 publications 1975: 20 publications 1976: 15 publications 1977: 16 publications 1978: 14 publications 1979: 20 publications 1980: 23 publications 1981: 14 publications 1982: 17 publications 1983: 16 publications 1984: 11 publications 1985: 8 publications 1986: 7 publications 1987: 9 publications 1988: 13 publications 1989: 5 publications 1990: 6 publications 1991: 2 publications 1992: 1 publication 1993: 1 publication 1994: 2 publications 1995: 2 publications 1996: 2 publications 1997: 1 publication 1998: 1 publication 1999: 1 publication 2000: 2 publications 2001: 1 publication 2002: 1 publication 2003: 1 publication 2004: 0 publications 2005: 0 publications 2006: 0 publications 2007: 1 publication 2008: 0 publications 2009: 0 publications 2010: 0 publications 2011: 1 publication 2012: 1 publication 2013: 1 publication 2014: 0 publications 2015: 0 publications 2016: 2 publications 2017: 1 publication 2018: 2 publications 2019: 1 publication 2020: 1 publication 2021: 0 publications 2022: 3 publications 2023: 4 publications 2024: 4 publications 2025: 5 publications 2026: 1 publication
1953 2026

367 publications in total across all disciplines

View publications per year as a table
Kenneth J. Ryan: publications per year, 1953 to 2026
Year Publications
1953 2
1954 0
1955 0
1956 2
1957 1
1958 2
1959 2
1960 1
1961 8
1962 3
1963 4
1964 5
1965 2
1966 5
1967 7
1968 3
1969 8
1970 9
1971 6
1972 11
1973 11
1974 15
1975 20
1976 15
1977 16
1978 14
1979 20
1980 23
1981 14
1982 17
1983 16
1984 11
1985 8
1986 7
1987 9
1988 13
1989 5
1990 6
1991 2
1992 1
1993 1
1994 2
1995 2
1996 2
1997 1
1998 1
1999 1
2000 2
2001 1
2002 1
2003 1
2004 0
2005 0
2006 0
2007 1
2008 0
2009 0
2010 0
2011 1
2012 1
2013 1
2014 0
2015 0
2016 2
2017 1
2018 2
2019 1
2020 1
2021 0
2022 3
2023 4
2024 4
2025 5
2026 1
Total 367
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Kenneth J. Ryan 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 Kenneth J. Ryan sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 321–340 publications, is where this scientist sits. 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: 610 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
101–120 publications 1,796+

This scientist: 332 publications — 24th percentile

24% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895 332
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537
561–580 504
581–600 509
601–620 396
621–640 386
641–660 371
661–680 340
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204
821–840 186
841–860 177
861–880 155
881–900 139
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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Kenneth J. Ryan 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 Kenneth J. Ryan sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 78–79 D-Index, is where this scientist sits. 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: 399 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
70–71 D-Index 217+

This scientist: 78 D-Index — 12th percentile

12% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391
74–75 574
76–77 730
78–79 891 78
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970
90–91 922
92–93 839
94–95 808
96–97 779
98–99 668
100–101 611
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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Research.com Recognitions

  • 2020 - Fellow of the American Statistical Association (ASA)
  • 1971 - Member of the National Academy of Medicine (NAM)

Overview

Kenneth J. Ryan was affiliated with Harvard University in the United States. Their research centered predominantly on medical and statistical fields, with a particular focus on infection control, immunology, and pulmonary medicine.

The scientist contributed extensively to the fields of Medicine, including subfields such as Pulmonary and Respiratory Medicine, Infectious Diseases, Immunology, and Safety, Risk, Reliability and Quality. Their work spanned several main topics:

  • Infection Control and Ventilation
  • Tuberculosis Research and Epidemiology
  • Immune responses and vaccinations
  • Infection Control in Healthcare
  • Statistical Methods and Bayesian Inference
  • Reliability and Maintenance Optimization
  • Statistical Distribution Estimation and Applications

Their notable publications appeared in journals including:

  • Quality Engineering
  • Journal of Occupational and Environmental Hygiene
  • Frontiers in Immunology
  • Special Matrices
  • American Journal of Infection Control

Kenneth J. Ryan co-authored work primarily with the following researchers:

  • Weihua Yang
  • Warren R. Myers
  • Edward M. Fisher
  • Ziqing Zhuang
  • Michael S. Hamada

Some of their recent papers include:

  • Total outward leakage of half-mask respirators and surgical masks used for source control, 2023, Journal of Occupational and Environmental Hygiene
  • IL-27 alters inflammatory cytokine expression and limits protective immunity against Mycobacterium tuberculosis in a neonatal BCG vaccination model, 2024, Frontiers in Immunology
  • Legendre pairs of lengthsℓ≡ 0 (mod 5), 2023, Special Matrices
  • Total outward leakage of face-worn products used by the general public for source control, 2024, American Journal of Infection Control
  • Evaluating source control efficacy against exhaled submicron particles: Total outward leakage of surgical masks and half facepiece respirators across a spectrum of particle sizes, 2024, Aerosol Science and Technology

Kenneth J. Ryan was recognized with distinctions including being named a Fellow of the American Statistical Association in 2020 and being a member of the National Academy of Medicine since 1971.

Best Publications

  • The formation of estrogens by central neuroendocrine tissues

    F Naftolin;K J Ryan;I J Davies;V V Reddy

  • Biological aromatization of steroids

    Kenneth J. Ryan

  • Insulin Stimulates Androgen Accumulation in Incubations of Ovarian Stroma Obtained from Women with Hyperandrogenism

    Robert L. Barbieri;Anastasia Makris;Rebecca W. Randall;Gilbert Daniels

  • The Microenvironment of the Human Antral Follicle: Interrelationships among the Steroid Levels in Antral Fluid, the Population of Granulosa Cells, and the Status of the Oocyte in Vivo and in Vitro

    Kenneth P. McNATTY;Dianne Moore Smith;Anastasia Makris;Rapin Osathanondh

  • The role of hyperinsulinemia in the pathogenesis of ovarian hyperandrogenism

    Edward E. Wallach;Robert L. Barbieri;Samuel Smith;Kenneth J. Ryan

  • Aromatization of Androstenedione by the Anterior Hypothalamus of Adult Male and Female Rats

    F. Naftolin;K. J. Ryan;Z. Petro

  • The production of progesterone, androgens, and estrogens by granulosa cells, thecal tissue, and stromal tissue from human ovaries in vitro.

    Kenneth P. McNATTY;Anastasia Makris;Camillo Degrazia;Osathanondh Rapin

  • AROMATIZATION OF ANDROSTENEDIONE BY THE DIENCEPHALON

    F. Naftolin;K. J. Ryan;Z. Petro

  • Hyperandrogenism, insulin resistance, and acanthosis nigricans syndrome: A common endocrinopathy with distinct pathophysiologic features

    Robert L. Barbieri;Robert L. Barbieri;Kenneth J. Ryan;Kenneth J. Ryan

  • Aromatization of androgens by human abdominal and breast fat tissue.

    A. Nimrod;K. J. Ryan

  • Determinants of Ovarian Cancer Risk. I. Reproductive Experiences and Family History

    Daniel W. Cramer;George B. Hutchison;William R. Welch;Robert E. Scully

  • HYDROXYLATION OF STEROIDS AT CARBON 21

    Kenneth J. Ryan;Lewis L. Engel

  • Phylogenetic distribution of aromatase and other androgen-converting enzymes in the central nervous system.

    Gloria V. Callard;Zoltan Petro;Kenneth J. Ryan

  • Risk Factors Accounting for Racial Differences in the Rate of Premature Birth

    Ellice Lieberman;Kenneth J. Ryan;Richard R. Monson;Stephen C. Schoenbaum

  • No association between coffee consumption and adverse outcomes of pregnancy.

    Shai Linn;Stephen C. Schoenbaum;Richard R. Monson;Bernard Rosner

  • Conversion of androstenedione to estrone by neural tissues from fetal and neonatal rats.

    V. V. R. Reddy;F. Naftolin;K. J. Ryan

  • Tihe Concentrations of Progesterone, Estrone and Estradiol-17β in the Plasma of Pregnant Rabbits

    John R. G. Challis;I. John Davies;Kenneth J. Ryan

  • Danazol: Endocrine pharmacology and therapeutic applications

    Robert L. Barbieri;Kenneth J. Ryan

  • Nicotine, cotinine, and anabasine inhibit aromatase in human trophoblast in vitro

    RL Barbieri;J Gochberg;KJ Ryan

  • Effects of Estrogens on Sleep and Psychological State of Hypogonadal Women

    Isaac Schiff;Quentin Regestein;Dan Tulchinsky;Kenneth J. Ryan

Frequent Co-Authors

Frederick Naftolin
Frederick Naftolin New York University
Robert L. Barbieri
Robert L. Barbieri Brigham and Women's Hospital
Richard R. Monson
Richard R. Monson Harvard University
John R. G. Challis
John R. G. Challis University of Toronto
Kurt Benirschke
Kurt Benirschke University of California, San Diego
Ellice Lieberman
Ellice Lieberman Brigham and Women's Hospital
Bernard Rosner
Bernard Rosner Harvard University
Susan E. Leeman
Susan E. Leeman Boston University
Lawrence Levine
Lawrence Levine Brandeis University
Samuel B. Formal
Samuel B. Formal Walter Reed Army Institute of Research

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