World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Mathematics 40 2012 1765 26 21 141 8843
Engineering and Technology 43 6057 5839 117 112 159 9146

Ger Koole publications per year

The chart shows the history of publications by Ger Koole between 1990 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ger Koole published across 36 years, from 1990 to 2025, averaging 5.1 papers a year. Output peaked at 13 publications in 2005. 5 of the 184 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1990 to 2025. Vertical axis: number of publications, 0 to 13. Peak 13 publications in 2005. 1990: 1 publication 1991: 0 publications 1992: 3 publications 1993: 3 publications 1994: 5 publications 1995: 6 publications 1996: 6 publications 1997: 3 publications 1998: 9 publications 1999: 6 publications 2000: 6 publications 2001: 6 publications 2002: 2 publications 2003: 5 publications 2004: 8 publications 2005: 13 publications 2006: 6 publications 2007: 5 publications 2008: 7 publications 2009: 4 publications 2010: 4 publications 2011: 9 publications 2012: 6 publications 2013: 7 publications 2014: 5 publications 2015: 9 publications 2016: 2 publications 2017: 6 publications 2018: 2 publications 2019: 3 publications 2020: 2 publications 2021: 9 publications 2022: 8 publications 2023: 3 publications 2024: 1 publication 2025: 4 publications
1990 2025

184 publications in total across all disciplines

View publications per year as a table
Ger Koole: publications per year, 1990 to 2025
Year Publications
1990 1
1991 0
1992 3
1993 3
1994 5
1995 6
1996 6
1997 3
1998 9
1999 6
2000 6
2001 6
2002 2
2003 5
2004 8
2005 13
2006 6
2007 5
2008 7
2009 4
2010 4
2011 9
2012 6
2013 7
2014 5
2015 9
2016 2
2017 6
2018 2
2019 3
2020 2
2021 9
2022 8
2023 3
2024 1
2025 4
Total 184
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Ger Koole publications per year - data summary

  • Ger Koole, a Mathematics scholar from Vrije Universiteit Amsterdam, has 184 publications recorded across 36 years, from 1990 to 2025.
  • The oldest publication on record dates to 1990 and the most recent to 2025.
  • The most productive year is 2005, with 13 publications.
  • The least productive years with any output are 1990 and 2024, with 1 publication each.
  • 1 of the 36 years in the span carries no publications at all (1991).
  • The rate of publication averages 5.1 papers per year over the whole span, or 5.3 per year counting only the 35 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 25 publications, 14% of the career total.
  • Split into equal eras - 1990-2001: 54 publications (4.5 per year); 2002-2013: 76 publications (6.3 per year); 2014-2025: 54 publications (4.5 per year).
  • Comparing the opening and closing eras, the overall trend of publication is broadly steady.

Ger Koole 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 Ger Koole 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, 137–141 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: 141 publications — 33rd percentile

33% 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
137–141 98 141
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
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Ger Koole 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.
  • Ger Koole, a Mathematics scholar from Vrije Universiteit Amsterdam, records 141 publications - the 33rd percentile of the discipline.
  • 33% of ranked Mathematics scientists score the same or lower than Ger Koole, and about 67% score higher.
  • The median of the discipline falls in the 172–176 publications range, and Ger Koole 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).

Ger Koole 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 Ger Koole 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, 40 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: 40 D-Index — 45th percentile

45% 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
34 136
35 127
36 145
37 153
38 150
39 150
40 138 40
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
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Ger Koole 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.
  • Ger Koole, a Mathematics scholar from Vrije Universiteit Amsterdam, records 40 D-Index - the 45th percentile of the discipline.
  • 45% of ranked Mathematics scientists score the same or lower than Ger Koole, and about 55% score higher.
  • The median of the discipline falls in the 42 D-Index range, and Ger Koole 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).

Overview

What is he best known for?

The fields of study he is best known for:

  • Statistics
  • Computer network
  • Artificial intelligence

His scientific interests lie mostly in Queueing theory, Mathematical optimization, Computer network, Dynamic programming and Distributed computing. His Queueing theory research incorporates themes from Dimensioning, Markov chain, Operations management and Operations research. Ger Koole interconnects Appointment scheduling and Local search, Local search procedure in the investigation of issues within Operations research.

The Mathematical optimization study combines topics in areas such as Real-time computing, Dynamic priority scheduling, Fair-share scheduling, Queue and Server. His Optimized Link State Routing Protocol, Mobility model and Mobile ad hoc network study in the realm of Computer network connects with subjects such as Relay. His research integrates issues of Node, Shared resource and Bellman equation in his study of Dynamic programming.

His most cited work include:

  • Commissioned Paper: Telephone Call Centers: Tutorial, Review, and Research Prospects (1096 citations)
  • The message delay in mobile ad hoc networks (577 citations)
  • Queueing models of call centers: An introduction (283 citations)

What are the main themes of his work throughout his whole career to date?

Ger Koole mainly investigates Mathematical optimization, Operations research, Queueing theory, Queue and Dynamic programming. His studies deal with areas such as Stochastic process, Real-time computing, Markov process and Job shop scheduling as well as Mathematical optimization. Ger Koole has researched Operations research in several fields, including Revenue management, Staffing, Scheduling and Reservation.

His work carried out in the field of Queueing theory brings together such families of science as Server and Markov chain. Queue is a subfield of Computer network that Ger Koole explores. His work carried out in the field of Dynamic programming brings together such families of science as Shared resource, Stochastic control and Bellman equation.

He most often published in these fields:

  • Mathematical optimization (30.72%)
  • Operations research (22.88%)
  • Queueing theory (22.22%)

What were the highlights of his more recent work (between 2014-2021)?

  • Operations research (22.88%)
  • Scheduling (12.42%)
  • Revenue (5.23%)

In recent papers he was focusing on the following fields of study:

The scientist’s investigation covers issues in Operations research, Scheduling, Revenue, Staffing and Revenue management. His work deals with themes such as Reservation, Markov decision process, Real-time computing, Queue and Call management, which intersect with Operations research. Markov decision process is often connected to Mathematical optimization in his work.

In his study, Total cost, Service system, Poisson process and Contact center is strongly linked to Multi channel, which falls under the umbrella field of Scheduling. His research integrates issues of Cover, Estimation and Operations management in his study of Staffing. As part of his studies on Service, Ger Koole often connects relevant subjects like Queueing theory.

Between 2014 and 2021, his most popular works were:

  • Costs and effects of Internet cognitive behavioral treatment blended with face-to-face treatment: Results from a naturalistic study (57 citations)
  • Revenue management under customer choice behaviour with cancellations and overbooking (29 citations)
  • Simulation-based optimization of staffing levels in an emergency department (22 citations)

In his most recent research, the most cited papers focused on:

  • Statistics
  • Computer network
  • Algorithm

Ger Koole spends much of his time researching Operations research, Markov decision process, Reservation, Dynamic programming and Mathematical optimization. His studies deal with areas such as Key, Resource allocation and Flexibility as well as Operations research. The concepts of his Reservation study are interwoven with issues in Economies of scale, Control, Real-time computing, Scheduling and Call management.

The Scheduling study combines topics in areas such as Call control, Multi channel, Callback, Poisson process and Service system. Ger Koole interconnects Queueing theory, Layered queueing network, Markov process and Curse of dimensionality in the investigation of issues within Dynamic programming. His research in Mathematical optimization is mostly focused on Heuristics.

Best Publications

  • Commissioned Paper: Telephone Call Centers: Tutorial, Review, and Research Prospects

    Noah Gans;Ger Koole;Avishai Mandelbaum

  • The message delay in mobile ad hoc networks

    Robin Groenevelt;Philippe Nain;Ger Koole

  • Queueing models of call centers: An introduction

    Ger Koole;Avishai Mandelbaum

  • Optimal outpatient appointment scheduling

    Guido C. Kaandorp;Ger Koole

  • Marked point processes as limits of Markovian arrival streams

    Søren Asmussen;Ger Koole

  • Managing uncertainty in call centres using Poisson mixtures

    Geurt Jongbloed;Ger Koole

  • Modeling the emergency cardiac in-patient flow: an application of queuing theory.

    Arnoud M. de Bruin;A. C. van Rossum;M. C. Visser;G. M. Koole

  • Dimensioning hospital wards using the Erlang loss model

    A. M. de Bruin;A. M. de Bruin;R. Bekker;L. van Zanten;G. M. Koole

  • Structural results for the control of queueing systems using event-based dynamic programming

    Ger Koole

  • On optimal call admission control in resource-sharing system

    E. Altman;T. Jimenez;G. Koole

  • Sample-Path Analysis of Queueing Systems

    G.M. Koole;M. El-Taha;S. Stidham

  • A queueing model for call blending in call centers

    S. Bhulai;G. Koole

  • Simple Methods for Shift Scheduling in Multiskill Call Centers

    Sandjai Bhulai;Ger Koole;Auke Pot

  • Performance analysis and optimization in customer contact centers

    G. Koole

  • Monotonicity in Markov Reward and Decision Chains: Theory and Applications

    Ger Koole

  • Message delay in MANET

    Robin Groenevelt;Philippe Nain;Ger Koole

  • Costs and effects of Internet cognitive behavioral treatment blended with face-to-face treatment: Results from a naturalistic study

    Robin M.F. Kenter;Peter M. van de Ven;Pim Cuijpers;Ger Koole

  • On the Optimality of the Generalized Shortest Queue Policy

    Arie Hordijk;Ger Koole

  • Resource allocation in grid computing

    Ger Koole;Rhonda Righter

  • Queueing-theoretic solution methods for models of parallel and distributed systems

    O.J. Boxma;G.M. Koole;Zhen Liu

  • Managing uncertainty in call centers using Poisson mixtures.

    G. Jongbloed;G.M. Koole

Frequent Co-Authors

Eitan Altman
Eitan Altman French Institute for Research in Computer Science and Automation - INRIA
Philippe Nain
Philippe Nain French Institute for Research in Computer Science and Automation - INRIA
Arie Hordijk
Arie Hordijk Leiden University
Pierre L'Ecuyer
Pierre L'Ecuyer University of Montreal
Yves Dallery
Yves Dallery CentraleSupélec
Marcel G. W. Dijkgraaf
Marcel G. W. Dijkgraaf University of Amsterdam
Bert Zwart
Bert Zwart Eindhoven University of Technology
Don Towsley
Don Towsley University of Massachusetts Amherst
Avishai Mandelbaum
Avishai Mandelbaum Technion – Israel Institute of Technology
Vivek S. Borkar
Vivek S. Borkar Indian Institute of Technology Bombay

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