Richard J. O’Callaghan

4.4k total citations
128 papers, 3.6k citations indexed

About

Richard J. O’Callaghan is a scholar working on Ophthalmology, Molecular Biology and Infectious Diseases. According to data from OpenAlex, Richard J. O’Callaghan has authored 128 papers receiving a total of 3.6k indexed citations (citations by other indexed papers that have themselves been cited), including 84 papers in Ophthalmology, 36 papers in Molecular Biology and 34 papers in Infectious Diseases. Recurrent topics in Richard J. O’Callaghan's work include Ocular Infections and Treatments (83 papers), Antimicrobial Resistance in Staphylococcus (33 papers) and Intraocular Surgery and Lenses (29 papers). Richard J. O’Callaghan is often cited by papers focused on Ocular Infections and Treatments (83 papers), Antimicrobial Resistance in Staphylococcus (33 papers) and Intraocular Surgery and Lenses (29 papers). Richard J. O’Callaghan collaborates with scholars based in United States, Saudi Arabia and Canada. Richard J. O’Callaghan's co-authors include James M. Hill, Armando R. Caballero, Mary E. Marquart, Judy M. Moreau, Michelle C. Callegan, Brett A. Thibodeaux, Lawrence S. Engel, Lee S. Engel, J A Hobden and Dalia O. Girgis and has published in prestigious journals such as Journal of Biological Chemistry, Analytical Biochemistry and Journal of Virology.

In The Last Decade

Richard J. O’Callaghan

128 papers receiving 3.5k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Richard J. O’Callaghan United States 36 1.5k 1.4k 801 716 484 128 3.6k
Michelle C. Callegan United States 34 1.9k 1.2× 1.2k 0.9× 384 0.5× 518 0.7× 310 0.6× 97 3.2k
Eric G. Romanowski United States 33 1.6k 1.1× 910 0.7× 706 0.9× 329 0.5× 219 0.5× 145 4.1k
Regis P. Kowalski United States 31 2.4k 1.5× 489 0.4× 751 0.9× 349 0.5× 238 0.5× 161 3.6k
Suzanne M. J. Fleiszig United States 44 1.6k 1.0× 2.8k 2.0× 1.6k 2.0× 254 0.4× 1.5k 3.0× 126 5.3k
Prajna Lalitha India 38 2.9k 1.9× 472 0.3× 1.5k 1.9× 780 1.1× 169 0.3× 162 4.1k
Martha Grout United States 22 92 0.1× 1.3k 0.9× 139 0.2× 301 0.4× 515 1.1× 23 2.4k
Michael Duchêne Austria 34 49 0.0× 1.2k 0.9× 340 0.4× 566 0.8× 122 0.3× 101 4.3k
Damien McDevitt United States 31 49 0.0× 2.2k 1.6× 751 0.9× 2.2k 3.1× 234 0.5× 38 3.6k
Stefan Zimmerli Switzerland 25 261 0.2× 241 0.2× 158 0.2× 1.5k 2.1× 47 0.1× 67 2.4k
Hiroshi Isogai Japan 27 137 0.1× 641 0.5× 264 0.3× 562 0.8× 29 0.1× 121 2.2k

Countries citing papers authored by Richard J. O’Callaghan

Since Specialization
Citations

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

Fields of papers citing papers by Richard J. O’Callaghan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Richard J. O’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 Richard J. O’Callaghan. The network helps show where Richard J. O’Callaghan may publish in the future.

Co-authorship network of co-authors of Richard J. O’Callaghan

This figure shows the co-authorship network connecting the top 25 collaborators of Richard J. O’Callaghan. A scholar is included among the top collaborators of Richard J. O’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 Richard J. O’Callaghan. Richard J. O’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.
O’Callaghan, Richard J.. (2018). The Pathogenesis of Staphylococcus aureus Eye Infections. Pathogens. 7(1). 9–9. 92 indexed citations
2.
Caballero, Armando R., Aihua Tang, & Richard J. O’Callaghan. (2012). Staphylococcus aureus Protease Activity and Ocular Virulence. Investigative Ophthalmology & Visual Science. 53(14). 6138–6138. 2 indexed citations
3.
Balzli, Charles L., et al.. (2012). Pathogenesis of Staphylococcus aureus Endophthalmitis: Analysis of Alpha-Toxin and Gamma-Toxin in the Rabbit Anterior Chamber. Investigative Ophthalmology & Visual Science. 53(14). 2772–2772. 1 indexed citations
4.
Balzli, Charles L., et al.. (2011). The Direct Action and Inhibition of Staphylococcus aureus Alpha-Toxin in the Anterior Chamber. Investigative Ophthalmology & Visual Science. 52(14). 2960–2960. 1 indexed citations
5.
Caballero, Armando R., et al.. (2010). Ocular Pathology of a Staphylococcus aureus Mutant Lacking a Recently Discovered Virulence Factor. Investigative Ophthalmology & Visual Science. 51(13). 3891–3891. 2 indexed citations
6.
Caballero, Armando R., et al.. (2009). A New Topical Model of Staphylococcus aureus Keratitis in a Scarified Rabbit Eye. Investigative Ophthalmology & Visual Science. 50(13). 2397–2397. 1 indexed citations
7.
Balzli, Charles L., et al.. (2009). A Rabbit Model of Staphylococcus aureus Anterior Chamber Infection and the Effectiveness of Prophylactic Therapy. Investigative Ophthalmology & Visual Science. 50(13). 3109–3109. 2 indexed citations
8.
Caballero, Armando R., et al.. (2009). Genetic Analysis of a New Staphylococcus aureus Isolate that Exhibits Exquisite Virulence in the Rabbit Cornea, Conjunctiva and Anterior Chamber. Investigative Ophthalmology & Visual Science. 50(13). 5112–5112. 1 indexed citations
9.
Caballero, Armando R., et al.. (2009). Chemical Inhibition of Alpha-Toxin, a Key Corneal Virulence Factor of Staphylococcus aureus. Investigative Ophthalmology & Visual Science. 50(6). 2848–2854. 43 indexed citations
10.
Caballero, Armando R., et al.. (2008). Isolation and Characterization of a New Staphylococcus aureus Protease. Investigative Ophthalmology & Visual Science. 49(13). 5514–5514. 3 indexed citations
11.
Thibodeaux, Brett A., Armando R. Caballero, Mary E. Marquart, Jan Tommassen, & Richard J. O’Callaghan. (2007). Corneal Virulence ofPseudomonas aeruginosaElastase B and Alkaline Protease Produced byPseudomonas putida. Current Eye Research. 32(4). 373–386. 33 indexed citations
12.
Dajcs, Joseph J., et al.. (2006). The Effectiveness of Lysostaphin Therapy for Experimental Coagulase-NegativeStaphylococcusEndophthalmitis. Current Eye Research. 31(3). 225–230. 8 indexed citations
13.
Thibodeaux, Brett A., Armando R. Caballero, Joseph J. Dajcs, et al.. (2005). Pseudomonas aeruginosaProtease IV: A Corneal Virulence Factor of Low Immunogenicity. Ocular Immunology and Inflammation. 13(2-3). 169–182. 13 indexed citations
14.
Thibodeaux, Brett A., et al.. (2002). Pseudomonas Protease And Corneal Virulence. Investigative Ophthalmology & Visual Science. 43(13). 1596–1596. 1 indexed citations
15.
Dajcs, Joseph J., Brett A. Thibodeaux, Dalia O. Girgis, & Richard J. O’Callaghan. (2002). Corneal Virulence of Staphylococcus aureus in an Experimental Model of Keratitis. DNA and Cell Biology. 21(5-6). 375–382. 46 indexed citations
16.
O’Callaghan, Richard J.. (1999). Role of Exoproteins in Bacterial Keratitis. Cornea. 18(5). 532–537. 63 indexed citations
17.
Moreau, Judy M., Gregory D. Sloop, Lee S. Engel, James M. Hill, & Richard J. O’Callaghan. (1997). Histopathological studies of staphylococcal alpha-toxin: effects on rabbit corneas. Current Eye Research. 16(12). 1221–1228. 39 indexed citations
18.
Callegan, Michelle C., Lee S. Engel, Thomas Clinch, et al.. (1994). Efficacy of tobramycin drops applied to collagen shields for experimental staphylococcal keratitis. Current Eye Research. 13(12). 875–878. 6 indexed citations
19.
Engel, Lee S., Michelle C. Callegan, James M. Hill, & Richard J. O’Callaghan. (1993). Bioassays for Quantitating Ciprofloxacin and Tobramycin in Aqueous Humor. Journal of Ocular Pharmacology and Therapeutics. 9(4). 311–320. 8 indexed citations
20.
Hobden, Jeffery A., Richard J. O’Callaghan, James M. Hill, et al.. (1989). Tobramycin iontophoresis into corneas infected with drug-resistant Pseudomonas aeruginosa. Current Eye Research. 8(11). 1163–1169. 15 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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