World's Best Scientists 2026 revealed!
Sigurdur Helgason

Sigurdur Helgason

D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Mathematics 33 2969 1193 134 24132

Sigurdur Helgason publications per year

The chart shows the history of publications by Sigurdur Helgason between 1955 and 2024, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Sigurdur Helgason published across 70 years, from 1955 to 2024, averaging 2.3 papers a year. Output peaked at 23 publications in 2001. 1 of the 163 publications appeared in the last two years.

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

163 publications in total across all disciplines

View publications per year as a table
Sigurdur Helgason: publications per year, 1955 to 2024
Year Publications
1955 1
1956 1
1957 2
1958 4
1959 1
1960 0
1961 1
1962 2
1963 4
1964 3
1965 2
1966 2
1967 1
1968 1
1969 2
1970 1
1971 0
1972 4
1973 3
1974 2
1975 2
1976 1
1977 4
1978 1
1979 0
1980 10
1981 3
1982 0
1983 2
1984 2
1985 3
1986 1
1987 2
1988 1
1989 0
1990 2
1991 1
1992 3
1993 1
1994 5
1995 0
1996 1
1997 2
1998 4
1999 7
2000 8
2001 23
2002 1
2003 1
2004 2
2005 3
2006 2
2007 1
2008 3
2009 1
2010 6
2011 6
2012 0
2013 2
2014 1
2015 3
2016 1
2017 1
2018 1
2019 0
2020 0
2021 1
2022 0
2023 0
2024 1
Total 163
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Sigurdur Helgason publications per year - data summary

  • Sigurdur Helgason, a Mathematics scholar from MIT, has 163 publications recorded across 70 years, from 1955 to 2024.
  • The oldest publication on record dates to 1955 and the most recent to 2024.
  • The most productive year is 2001, with 23 publications.
  • The least productive years with any output are 1955, 1956, 1959, 1961 and others, with 1 publication each.
  • 11 of the 70 years in the span carry no publications at all (1960, 1971, 1979, 1982 and others).
  • The rate of publication averages 2.3 papers per year over the whole span, or 2.8 per year counting only the 59 years with at least one publication.
  • The last 5 years on the chart (2020-2024) hold 2 publications, 1% of the career total.
  • Split into equal eras - 1955-1978: 45 publications (1.9 per year); 1979-2002: 82 publications (3.4 per year); 2003-2024: 36 publications (1.6 per year).
  • Comparing the opening and closing eras, the overall trend of publication is broadly steady.

Sigurdur Helgason publication distribution in Mathematics in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Mathematics in 2026. The highlighted bar marks where Sigurdur Helgason sits on this spectrum.

No. of scientists
25 50 75 100
Bar chart with 100 bars. Horizontal axis: publications, 42–46 to 537+. Vertical axis: number of scientists, 0 to 112. Most scientists, 112, have 142–146 publications. The last bar groups every scientist with 537 publications or more. The highlighted bar, 132–136 publications, is where this scientist sits. 42–46 publications: 3 scientists 47–51 publications: 5 scientists 52–56 publications: 7 scientists 57–61 publications: 20 scientists 62–66 publications: 14 scientists 67–71 publications: 25 scientists 72–76 publications: 19 scientists 77–81 publications: 35 scientists 82–86 publications: 50 scientists 87–91 publications: 60 scientists 92–96 publications: 86 scientists 97–101 publications: 84 scientists 102–106 publications: 83 scientists 107–111 publications: 90 scientists 112–116 publications: 99 scientists 117–121 publications: 90 scientists 122–126 publications: 91 scientists 127–131 publications: 109 scientists 132–136 publications: 110 scientists 137–141 publications: 98 scientists 142–146 publications: 112 scientists 147–151 publications: 102 scientists 152–156 publications: 88 scientists 157–161 publications: 106 scientists 162–166 publications: 83 scientists 167–171 publications: 102 scientists 172–176 publications: 77 scientists 177–181 publications: 81 scientists 182–186 publications: 78 scientists 187–191 publications: 71 scientists 192–196 publications: 92 scientists 197–201 publications: 64 scientists 202–206 publications: 69 scientists 207–211 publications: 64 scientists 212–216 publications: 62 scientists 217–221 publications: 58 scientists 222–226 publications: 53 scientists 227–231 publications: 50 scientists 232–236 publications: 46 scientists 237–241 publications: 46 scientists 242–246 publications: 46 scientists 247–251 publications: 43 scientists 252–256 publications: 29 scientists 257–261 publications: 45 scientists 262–266 publications: 30 scientists 267–271 publications: 33 scientists 272–276 publications: 34 scientists 277–281 publications: 30 scientists 282–286 publications: 31 scientists 287–291 publications: 21 scientists 292–296 publications: 34 scientists 297–301 publications: 26 scientists 302–306 publications: 10 scientists 307–311 publications: 17 scientists 312–316 publications: 23 scientists 317–321 publications: 13 scientists 322–326 publications: 16 scientists 327–331 publications: 26 scientists 332–336 publications: 13 scientists 337–341 publications: 13 scientists 342–346 publications: 16 scientists 347–351 publications: 17 scientists 352–356 publications: 12 scientists 357–361 publications: 18 scientists 362–366 publications: 18 scientists 367–371 publications: 9 scientists 372–376 publications: 11 scientists 377–381 publications: 8 scientists 382–386 publications: 8 scientists 387–391 publications: 9 scientists 392–396 publications: 9 scientists 397–401 publications: 8 scientists 402–406 publications: 11 scientists 407–411 publications: 6 scientists 412–416 publications: 6 scientists 417–421 publications: 9 scientists 422–426 publications: 8 scientists 427–431 publications: 5 scientists 432–436 publications: 8 scientists 437–441 publications: 8 scientists 442–446 publications: 4 scientists 447–451 publications: 4 scientists 452–456 publications: 4 scientists 457–461 publications: 2 scientists 462–466 publications: 2 scientists 467–471 publications: 4 scientists 472–476 publications: 3 scientists 477–481 publications: 3 scientists 482–486 publications: 6 scientists 487–491 publications: 3 scientists 492–496 publications: 5 scientists 497–501 publications: 5 scientists 502–506 publications: 1 scientist 507–511 publications: 6 scientists 512–516 publications: 4 scientists 517–521 publications: 1 scientist 522–526 publications: 3 scientists 527–531 publications: 1 scientist 532–536 publications: 4 scientists 537+ publications: 100 scientists
42–46 publications 537+

This scientist: 134 publications — 29th percentile

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

The last bar groups every scientist with 537 publications or more.

View publications distribution as a table
Number of Mathematics scientists by publication count, Research.com 2026 ranking edition. Based on 3,584 ranked scientists.
Publications Scientists This scientist
42–46 3
47–51 5
52–56 7
57–61 20
62–66 14
67–71 25
72–76 19
77–81 35
82–86 50
87–91 60
92–96 86
97–101 84
102–106 83
107–111 90
112–116 99
117–121 90
122–126 91
127–131 109
132–136 110 134
137–141 98
142–146 112
147–151 102
152–156 88
157–161 106
162–166 83
167–171 102
172–176 77
177–181 81
182–186 78
187–191 71
192–196 92
197–201 64
202–206 69
207–211 64
212–216 62
217–221 58
222–226 53
227–231 50
232–236 46
237–241 46
242–246 46
247–251 43
252–256 29
257–261 45
262–266 30
267–271 33
272–276 34
277–281 30
282–286 31
287–291 21
292–296 34
297–301 26
302–306 10
307–311 17
312–316 23
317–321 13
322–326 16
327–331 26
332–336 13
337–341 13
342–346 16
347–351 17
352–356 12
357–361 18
362–366 18
367–371 9
372–376 11
377–381 8
382–386 8
387–391 9
392–396 9
397–401 8
402–406 11
407–411 6
412–416 6
417–421 9
422–426 8
427–431 5
432–436 8
437–441 8
442–446 4
447–451 4
452–456 4
457–461 2
462–466 2
467–471 4
472–476 3
477–481 3
482–486 6
487–491 3
492–496 5
497–501 5
502–506 1
507–511 6
512–516 4
517–521 1
522–526 3
527–531 1
532–536 4
537+ 100
Download as CSV

Sigurdur Helgason publication distribution in Mathematics in 2026 - data summary

  • The chart plots the publication count of all 3,584 Mathematics scientists ranked by Research.com in 2026, grouped into 100 ranges running from 42–46 to 537+ publications.
  • Sigurdur Helgason, a Mathematics scholar from MIT, records 134 publications - the 29th percentile of the discipline.
  • 29% of ranked Mathematics scientists score the same or lower than Sigurdur Helgason, and about 71% score higher.
  • The median of the discipline falls in the 172–176 publications range, and Sigurdur Helgason ranks below the median.
  • The most crowded range is 142–146 publications, holding 112 scientists (3% of the field).
  • 47% of the field sits in the lowest quarter of the value range (up to 162–166 publications), so the distribution leans towards the lower end of the scale.
  • The final bar has no upper bound: it groups every scientist with 537 publications or more, 100 scientists in all (3% of the field).

Sigurdur Helgason D-index placement in Mathematics in 2026

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

No. of scientists
50 100 150
Bar chart with 57 bars. Horizontal axis: D-Index, 30 to 86+. Vertical axis: number of scientists, 0 to 174. Most scientists, 174, have 30 D-Index. The last bar groups every scientist with 86 D-Index or more. The highlighted bar, 33 D-Index, is where this scientist sits. 30 D-Index: 174 scientists 31 D-Index: 151 scientists 32 D-Index: 174 scientists 33 D-Index: 117 scientists 34 D-Index: 136 scientists 35 D-Index: 127 scientists 36 D-Index: 145 scientists 37 D-Index: 153 scientists 38 D-Index: 150 scientists 39 D-Index: 150 scientists 40 D-Index: 138 scientists 41 D-Index: 136 scientists 42 D-Index: 93 scientists 43 D-Index: 108 scientists 44 D-Index: 115 scientists 45 D-Index: 112 scientists 46 D-Index: 103 scientists 47 D-Index: 75 scientists 48 D-Index: 59 scientists 49 D-Index: 67 scientists 50 D-Index: 60 scientists 51 D-Index: 57 scientists 52 D-Index: 59 scientists 53 D-Index: 62 scientists 54 D-Index: 60 scientists 55 D-Index: 50 scientists 56 D-Index: 42 scientists 57 D-Index: 54 scientists 58 D-Index: 50 scientists 59 D-Index: 42 scientists 60 D-Index: 41 scientists 61 D-Index: 35 scientists 62 D-Index: 40 scientists 63 D-Index: 21 scientists 64 D-Index: 31 scientists 65 D-Index: 27 scientists 66 D-Index: 29 scientists 67 D-Index: 19 scientists 68 D-Index: 25 scientists 69 D-Index: 17 scientists 70 D-Index: 18 scientists 71 D-Index: 12 scientists 72 D-Index: 14 scientists 73 D-Index: 13 scientists 74 D-Index: 18 scientists 75 D-Index: 9 scientists 76 D-Index: 11 scientists 77 D-Index: 10 scientists 78 D-Index: 9 scientists 79 D-Index: 16 scientists 80 D-Index: 12 scientists 81 D-Index: 10 scientists 82 D-Index: 5 scientists 83 D-Index: 5 scientists 84 D-Index: 13 scientists 85 D-Index: 6 scientists 86+ D-Index: 99 scientists
30 D-Index 86+

This scientist: 33 D-Index — 17th percentile

17% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 86 D-Index or more.

View D-Index distribution as a table
Number of Mathematics scientists by D-index, Research.com 2026 ranking edition. Based on 3,584 ranked scientists.
D-Index Scientists This scientist
30 174
31 151
32 174
33 117 33
34 136
35 127
36 145
37 153
38 150
39 150
40 138
41 136
42 93
43 108
44 115
45 112
46 103
47 75
48 59
49 67
50 60
51 57
52 59
53 62
54 60
55 50
56 42
57 54
58 50
59 42
60 41
61 35
62 40
63 21
64 31
65 27
66 29
67 19
68 25
69 17
70 18
71 12
72 14
73 13
74 18
75 9
76 11
77 10
78 9
79 16
80 12
81 10
82 5
83 5
84 13
85 6
86+ 99
Download as CSV

Sigurdur Helgason D-index placement in Mathematics in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 3,584 Mathematics scientists ranked by Research.com in 2026, grouped into 57 ranges running from 30 to 86+ D-Index.
  • Sigurdur Helgason, a Mathematics scholar from MIT, records 33 D-Index - the 17th percentile of the discipline.
  • 17% of ranked Mathematics scientists score the same or lower than Sigurdur Helgason, and about 83% score higher.
  • The median of the discipline falls in the 42 D-Index range, and Sigurdur Helgason ranks below the median.
  • The most crowded range is 30 D-Index, holding 174 scientists (5% of the field).
  • 58% of the field sits in the lowest quarter of the value range (up to 44 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 86 D-Index or more, 99 scientists in all (3% of the field).

Research.com Recognitions

  • 2013 - Fellow of the American Mathematical Society
  • 1970 - Fellow of the American Academy of Arts and Sciences
  • 1964 - Fellow of John Simon Guggenheim Memorial Foundation

Overview

Sigurdur Helgason was affiliated with MIT in the United States. Their research focused primarily on fields such as Medicine, Neuroscience, and Psychology, with additional work in subfields including Physiology, Cognitive Neuroscience, and Experimental and Cognitive Psychology.

The scientist's research encompassed topics related to obstructive sleep apnea, sleep and wakefulness, and sleep-related disorders.

  • Obstructive Sleep Apnea Research
  • Sleep and Wakefulness Research
  • Sleep and related disorders

Among the published work, Sigurdur Helgason contributed to a paper titled "Evaluating the feasibility of out-of-center sleep testing (OCST), level II polysomnography (PSG) - The experience of a Canadian service provider," published in 2024 in the journal Sleep Medicine.

  • Evaluating the feasibility of out-of-center sleep testing (OCST), level II polysomnography (PSG) - The experience of a Canadian service provider (2024, Sleep Medicine)

Frequent co-authors who collaborated with Sigurdur Helgason included:

  • J. Leech
  • Christian Guilbault
  • Tetyana Kendzerska
  • Nancy Morin
  • Carlos Teixeira

Their work was published notably in the journal Sleep Medicine, reflecting a concentration within sleep-related research domains.

  • Sleep Medicine

Throughout their career, Sigurdur Helgason received several fellowships, including:

  • Fellow of the American Mathematical Society (2013)
  • Fellow of the American Academy of Arts and Sciences (1970)
  • Fellow of the John Simon Guggenheim Memorial Foundation (1964)

Best Publications

  • Differential Geometry, Lie Groups, and Symmetric Spaces

    Sigurdur Helgason

  • Differential Geometry and Symmetric Spaces

    Sigurdur Helgason

  • Groups and geometric analysis

    Sigurdur Helgason

  • The Radon Transform

    Sigurdur Helgason

  • Geometric Analysis on Symmetric Spaces

    Sigurdur Helgason

  • LIE GROUPS AND SYMMETRIC SPACES.

    S. Helgason

  • A duality for symmetric spaces with applications to group representations

    Sigurdur Helgason

  • The Radon transform on Euclidean spaces, compact two-point homogeneous spaces and Grassmann manifolds

    Sigurdur Helgason

  • Integral Geometry and Radon Transforms

    Sigurdur Helgason

  • Differential operators on homogeneous spaces

    Unknown

  • Topics in Harmonic Analysis on Homogeneous Spaces

    Sigurdur Helgason

  • The Surjectivity of Invariant Differential Operators on Symmetric Spaces I

    Sigurdur Helgason

  • Eigenspaces of the Laplacian; integral representations and irreducibility

    Sigurdur Helgason

  • Multipliers of Banach Algebras

    S. Helgason

  • An analogue of the Paley-Wiener theorem for the Fourier transform on certain symmetric spaces

    Sigurdur Helgason

  • Fundamental Solutions of Invariant Differential Operators on Symmetric Spaces

    S. Helgason

  • A duality for symmetric spaces with applications to group representations, II. Differential equations and eigenspace representations

    Sigurdur Helgason

  • The bounded spherical functions on symmetric spaces

    Sigurdur Helgason;Kenneth Johnson

  • Radon-Fourier transforms on symmetric spaces and related group representations

    S. Helgason

  • Analysis on Lie Groups and Homogeneous Spaces

    Sigurdur Helgason

  • A duality in integral geometry; some generalizations of the Radon transform

    Sigurdur Helgason

  • Differential Geometry and Symmetric Spaces.

    Carl B. Allendoerfer;Sigurdur Helgason

  • A duality for symmetric spaces

    Sigurdur Helgason

Frequent Co-Authors

David Mumford
David Mumford Brown University
Raoul Bott
Raoul Bott Harvard University
Michael Atiyah
Michael Atiyah University of Edinburgh
Dana Scott
Dana Scott University of California, Berkeley
Carlos A. Berenstein
Carlos A. Berenstein University of Maryland, College Park

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