Gregory D. O'Brien

753 total citations
7 papers, 567 citations indexed

About

Gregory D. O'Brien is a scholar working on Epidemiology, Surgery and Obstetrics and Gynecology. According to data from OpenAlex, Gregory D. O'Brien has authored 7 papers receiving a total of 567 indexed citations (citations by other indexed papers that have themselves been cited), including 3 papers in Epidemiology, 2 papers in Surgery and 2 papers in Obstetrics and Gynecology. Recurrent topics in Gregory D. O'Brien's work include Bone fractures and treatments (3 papers), Pregnancy and preeclampsia studies (2 papers) and Hip disorders and treatments (2 papers). Gregory D. O'Brien is often cited by papers focused on Bone fractures and treatments (3 papers), Pregnancy and preeclampsia studies (2 papers) and Hip disorders and treatments (2 papers). Gregory D. O'Brien collaborates with scholars based in United Kingdom, United States and Switzerland. Gregory D. O'Brien's co-authors include John T. Queenan, Stuart Campbell, Joe Leigh Simpson, William P. Collins, S. Campbell, Charles H. Rodeck, Peter Warren and Hugh P. Robinson and has published in prestigious journals such as American Journal of Obstetrics and Gynecology, Fertility and Sterility and The Medical Journal of Australia.

In The Last Decade

Gregory D. O'Brien

7 papers receiving 515 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Gregory D. O'Brien United Kingdom 7 241 195 157 156 92 7 567
R Breckle United States 15 338 1.4× 237 1.2× 153 1.0× 79 0.5× 129 1.4× 32 608
Lachlan Ch. de Crespigny Australia 13 201 0.8× 92 0.5× 213 1.4× 227 1.5× 82 0.9× 32 519
A. H. Adam United Kingdom 10 192 0.8× 110 0.6× 281 1.8× 328 2.1× 42 0.5× 15 533
Thomas S. Kosasa United States 18 198 0.8× 97 0.5× 286 1.8× 143 0.9× 77 0.8× 34 601
John Quagliarello United States 14 144 0.6× 125 0.6× 332 2.1× 241 1.5× 43 0.5× 29 574
I. Bar‐Hava Israel 17 350 1.5× 186 1.0× 239 1.5× 333 2.1× 153 1.7× 55 711
I. Eibschitz Israel 12 118 0.5× 116 0.6× 194 1.2× 185 1.2× 54 0.6× 27 441
Joseph Har-Toov Israel 16 214 0.9× 236 1.2× 174 1.1× 151 1.0× 93 1.0× 38 561
Géraldine Porcu France 10 162 0.7× 201 1.0× 185 1.2× 92 0.6× 74 0.8× 13 415
Richard H. Picker Australia 13 89 0.4× 64 0.3× 198 1.3× 186 1.2× 62 0.7× 33 420

Countries citing papers authored by Gregory D. O'Brien

Since Specialization
Citations

This map shows the geographic impact of Gregory D. O'Brien'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 Gregory D. O'Brien with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Gregory D. O'Brien more than expected).

Fields of papers citing papers by Gregory D. O'Brien

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Gregory D. O'Brien. 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 Gregory D. O'Brien. The network helps show where Gregory D. O'Brien may publish in the future.

Co-authorship network of co-authors of Gregory D. O'Brien

This figure shows the co-authorship network connecting the top 25 collaborators of Gregory D. O'Brien. A scholar is included among the top collaborators of Gregory D. O'Brien 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 Gregory D. O'Brien. Gregory D. O'Brien is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

7 of 7 papers shown
1.
2.
O'Brien, Gregory D. & John T. Queenan. (1982). Ultrasound fetal femur length in relation to intrauterine growth retardation. American Journal of Obstetrics and Gynecology. 144(1). 35–39. 20 indexed citations
3.
O'Brien, Gregory D. & John T. Queenan. (1981). Growth of the ultrasound fetal femur length during normal pregnancy. American Journal of Obstetrics and Gynecology. 141(7). 833–837. 103 indexed citations
4.
O'Brien, Gregory D., John T. Queenan, & Stuart Campbell. (1981). Assessment of gestational age in the second trimester by real-time ultrasound measurement of the femur length. American Journal of Obstetrics and Gynecology. 139(5). 540–545. 130 indexed citations
5.
O'Brien, Gregory D., Charles H. Rodeck, & John T. Queenan. (1980). Early prenatal diagnosis of diastrophic dwarfism by ultrasound.. BMJ. 280(6227). 1300.1–1300. 23 indexed citations
6.
Queenan, John T., et al.. (1980). Ultrasound Scanning of Ovaries to Detect Ovulation in Women. Fertility and Sterility. 34(2). 99–105. 188 indexed citations
7.
Queenan, John T., Gregory D. O'Brien, & S. Campbell. (1980). Ultrasound measurement of fetal limb bones. American Journal of Obstetrics and Gynecology. 138(3). 297–302. 91 indexed citations

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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