William M. Callaghan

25.4k total citations · 14 hit papers
167 papers, 18.1k citations indexed

About

William M. Callaghan is a scholar working on Pediatrics, Perinatology and Child Health, Obstetrics and Gynecology and Public Health, Environmental and Occupational Health. According to data from OpenAlex, William M. Callaghan has authored 167 papers receiving a total of 18.1k indexed citations (citations by other indexed papers that have themselves been cited), including 113 papers in Pediatrics, Perinatology and Child Health, 106 papers in Obstetrics and Gynecology and 33 papers in Public Health, Environmental and Occupational Health. Recurrent topics in William M. Callaghan's work include Maternal and fetal healthcare (68 papers), Maternal and Perinatal Health Interventions (62 papers) and Pregnancy and preeclampsia studies (46 papers). William M. Callaghan is often cited by papers focused on Maternal and fetal healthcare (68 papers), Maternal and Perinatal Health Interventions (62 papers) and Pregnancy and preeclampsia studies (46 papers). William M. Callaghan collaborates with scholars based in United States, Kenya and Uganda. William M. Callaghan's co-authors include Cynthia J. Berg, Elena V. Kuklina, Andreea A. Creanga, Patricia M. Dietz, Carla Syverson, Kristi Seed, Lucinda J. England, Susan Y. Chu, Brian T. Bateman and Shin Y. Kim and has published in prestigious journals such as New England Journal of Medicine, JAMA and PLoS ONE.

In The Last Decade

William M. Callaghan

165 papers receiving 17.3k citations

Hit Papers

Maternal Obesity and Risk... 2007 2026 2013 2019 2007 2017 2012 2019 2014 250 500 750
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. Maternal Obesity and Risk of Gestational Diabetes Mellitus
    2007 807 citations William M. Callaghan, Lucinda J. England et al. Diabetes Care profile →
  2. Pregnancy-Related Mortality in the United States, 2011–2013
    2017 699 citations Carla Syverson, Kristi Seed et al. Obstetrics and Gynecology profile →
  3. Severe Maternal Morbidity Among Delivery and Postpartum Hospitalizations in the United States
    2012 647 citations William M. Callaghan, Elena V. Kuklina et al. Obstetrics and Gynecology profile →
  4. Racial/Ethnic Disparities in Pregnancy-Related Deaths — United States, 2007–2016
    2019 569 citations Emily E. Petersen, Nicole L. Davis et al. MMWR Morbidity and Mortality Weekly Report profile →
  5. Pregnancy-Related Mortality in the United States, 2006–2010
    2014 567 citations Cynthia J. Berg, Carla Syverson et al. Obstetrics and Gynecology profile →
  6. Vital Signs: Pregnancy-Related Deaths, United States, 2011–2015, and Strategies for Prevention, 13 States, 2013–2017
    2019 553 citations Emily E. Petersen, Nicole L. Davis et al. MMWR Morbidity and Mortality Weekly Report profile →
  7. Trends in postpartum hemorrhage in high resource countries: a review and recommendations from the International Postpartum Hemorrhage Collaborative Group
    2009 518 citations Marian Knight, William M. Callaghan et al. BMC Pregnancy and Childbirth profile →
  8. Opioid Use Disorder Documented at Delivery Hospitalization — United States, 1999–2014
    2018 502 citations William M. Callaghan et al. MMWR Morbidity and Mortality Weekly Report profile →
  9. Hypertensive Disorders and Severe Obstetric Morbidity in the United States
    2009 461 citations Elena V. Kuklina, Carma Ayala et al. Obstetrics and Gynecology profile →
  10. Pregnancy-Related Mortality in the United States, 1998 to 2005
    2010 439 citations Cynthia J. Berg, William M. Callaghan et al. Obstetrics and Gynecology profile →
  11. Trends in postpartum hemorrhage: United States, 1994–2006
    2010 369 citations William M. Callaghan, Elena V. Kuklina et al. American Journal of Obstetrics and Gynecology profile →
  12. Development of a Comorbidity Index for Use in Obstetric Patients
    2013 347 citations William M. Callaghan et al. Obstetrics and Gynecology profile →
  13. Racial and ethnic disparities in severe maternal morbidity: a multistate analysis, 2008-2010
    2013 329 citations Elena V. Kuklina, William M. Callaghan et al. American Journal of Obstetrics and Gynecology profile →
  14. Maternal Mortality and Morbidity in the United States: Where Are We Now?
    2014 306 citations Cynthia J. Berg, William M. Callaghan et al. profile →

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author Last Decade Papers Cites
William M. Callaghan 11.1k 10.9k 5.2k 1.9k 1.8k 167 18.1k
G Justus Hofmeyr 10.1k 0.9× 11.2k 1.0× 5.4k 1.0× 1.6k 0.8× 707 0.4× 353 16.3k
K.S. Joseph 11.8k 1.1× 10.7k 1.0× 4.0k 0.8× 1.4k 0.7× 894 0.5× 313 17.5k
Marian Knight 6.8k 0.6× 7.2k 0.7× 3.6k 0.7× 2.0k 1.0× 886 0.5× 387 13.1k
Mary E. D’Alton 10.8k 1.0× 8.1k 0.7× 3.6k 0.7× 2.6k 1.3× 980 0.6× 454 16.3k
Michael W. Varner 10.5k 0.9× 12.1k 1.1× 6.6k 1.3× 3.1k 1.6× 937 0.5× 572 21.5k
William A. Grobman 6.2k 0.6× 5.9k 0.5× 4.3k 0.8× 999 0.5× 726 0.4× 527 13.5k
A Metin Gülmezoglu 9.7k 0.9× 7.5k 0.7× 4.2k 0.8× 754 0.4× 483 0.3× 122 14.6k
Joel G. Ray 5.6k 0.5× 6.5k 0.6× 2.6k 0.5× 4.0k 2.1× 4.5k 2.5× 415 19.3k
Lale Say 19.9k 1.8× 11.9k 1.1× 6.4k 1.2× 1.4k 0.7× 855 0.5× 167 29.0k
Andrew Shennan 7.5k 0.7× 9.0k 0.8× 4.1k 0.8× 1.7k 0.9× 2.4k 1.4× 533 15.6k

Countries citing papers authored by William M. Callaghan

Since Specialization
Citations

This map shows the geographic impact of William M. Callaghan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by William M. Callaghan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites William M. Callaghan more than expected).

Fields of papers citing papers by William M. Callaghan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by William M. Callaghan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by William M. Callaghan. The network helps show where William M. Callaghan may publish in the future.

Co-authorship network of co-authors of William M. Callaghan

This figure shows the co-authorship network connecting the top 25 collaborators of William M. Callaghan. A scholar is included among the top collaborators of William M. Callaghan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with William M. Callaghan. William M. Callaghan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Christensen, Deborah, Karen Pazol, Lucinda J. England, et al.. (2023). Prenatal ultrasound use and risk of autism spectrum disorder: Findings from the case‐control Study to Explore Early Development. Paediatric and Perinatal Epidemiology. 37(6). 527–535. 1 indexed citations
2.
Kramer, Michael R., et al.. (2019). Changing the conversation: applying a health equity framework to maternal mortality reviews. American Journal of Obstetrics and Gynecology. 221(6). 609.e1–609.e9. 47 indexed citations
3.
Petersen, Emily E., Nicole L. Davis, David A. Goodman, et al.. (2019). Racial/Ethnic Disparities in Pregnancy-Related Deaths — United States, 2007–2016. MMWR Morbidity and Mortality Weekly Report. 68(35). 762–765. 569 indexed citations breakdown →
4.
Romero, Rafael, Gary A. Dildy, William M. Callaghan, et al.. (2017). Proposed Diagnostic Criteria for the Case Definition of Amniotic Fluid Embolism in Research Studies. Obstetric Anesthesia Digest. 37(3). 115–115. 1 indexed citations
5.
Monsour, Michael, et al.. (2015). Trends in Severe Maternal Morbidity After Assisted Reproductive Technology in the United States, 2008–2012. Obstetrics and Gynecology. 127(1). 59–66. 70 indexed citations
6.
Kilpatrick, Sarah J., Cynthia J. Berg, Peter S. Bernstein, et al.. (2014). Standardized Severe Maternal Morbidity Review. Obstetrics and Gynecology. 124(2). 361–366. 66 indexed citations
7.
Robbins, Cheryl L., et al.. (2013). History of preterm birth and subsequent cardiovascular disease: a systematic review. American Journal of Obstetrics and Gynecology. 210(4). 285–297. 99 indexed citations
8.
Pazol, Karen, Loretta Gavin, William M. Callaghan, et al.. (2011). Vital signs: teen pregnancy - United States, 1991-2009.. MMWR Morbidity and Mortality Weekly Report. 60(13). 414–420. 85 indexed citations
9.
Zhou, Min, William M. Callaghan, Samuel F. Posner, et al.. (2011). Clinical Indications and Determinants of the Rise of Cesarean Section in Three Hospitals in Rural China. Maternal and Child Health Journal. 16(7). 1484–1490. 27 indexed citations
10.
Berg, Cynthia J., William M. Callaghan, Zsakeba Henderson, & Carla Syverson. (2011). Pregnancy-Related Mortality in the United States, 1998 to 2005. Obstetrics and Gynecology. 117(5). 1230–1230. 54 indexed citations
11.
Knight, Marian, William M. Callaghan, Cynthia J. Berg, et al.. (2010). Trends in Postpartum Hemorrhage in High Resource Countries: A Review and Recommendations From the International Postpartum Hemorrhage Collaborative Group. Obstetrical & Gynecological Survey. 65(4). 211–212. 11 indexed citations
12.
Albrecht, Sandra S., Elena V. Kuklina, Pooja Bansil, et al.. (2010). Diabetes Trends Among Delivery Hospitalizations in the U.S., 1994–2004. Diabetes Care. 33(4). 768–773. 222 indexed citations
13.
Kuklina, Elena V., Carma Ayala, & William M. Callaghan. (2009). Hypertensive Disorders and Severe Obstetric Morbidity in the United States. Obstetrics and Gynecology. 113(6). 1299–1306. 461 indexed citations breakdown →
14.
Dietz, Patricia M., William M. Callaghan, Ruben Smith, & Andrea J. Sharma. (2009). Low pregnancy weight gain and small for gestational age: a comparison of the association using 3 different measures of small for gestational age. American Journal of Obstetrics and Gynecology. 201(1). 53.e1–53.e7. 25 indexed citations
15.
Knight, Marian, William M. Callaghan, Cynthia J. Berg, et al.. (2009). Trends in postpartum hemorrhage in high resource countries: a review and recommendations from the International Postpartum Hemorrhage Collaborative Group. BMC Pregnancy and Childbirth. 9(1). 55–55. 518 indexed citations breakdown →
16.
Kuklina, Elena V. & William M. Callaghan. (2009). Cardiomyopathy and Other Myocardial Disorders Among Hospitalizations for Pregnancy in the United States. Obstetrics and Gynecology. 115(1). 93–100. 55 indexed citations
17.
Dietz, Patricia M., Selvi B Williams, William M. Callaghan, et al.. (2007). Clinically Identified Maternal Depression Before, During, and After Pregnancies Ending in Live Births. American Journal of Psychiatry. 164(10). 1515–1520. 269 indexed citations
18.
Lydon‐Rochelle, Mona T., Victoria L. Holt, Vicky Cárdenas, et al.. (2005). The reporting of pre-existing maternal medical conditions and complications of pregnancy on birth certificates and in hospital discharge data. American Journal of Obstetrics and Gynecology. 193(1). 125–134. 301 indexed citations
19.
McDermott, Suzanne, et al.. (2001). Perinatal risk for mortality and mental retardation associated with maternal urinary-tract infections.. PubMed. 50(5). 433–7. 44 indexed citations
20.
Callaghan, William M.. (1953). Military Sea Transportation Service. Naval War College review. 6(1). 3.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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