Zachary M. Callahan

20 papers and 211 indexed citations i.

About

Zachary M. Callahan is a scholar working on Surgery, Gastroenterology and Speech and Hearing. According to data from OpenAlex, Zachary M. Callahan has authored 20 papers receiving a total of 211 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Surgery, 9 papers in Gastroenterology and 7 papers in Speech and Hearing. Recurrent topics in Zachary M. Callahan’s work include Esophageal and GI Pathology (12 papers), Gastroesophageal reflux and treatments (8 papers) and Dysphagia Assessment and Management (7 papers). Zachary M. Callahan is often cited by papers focused on Esophageal and GI Pathology (12 papers), Gastroesophageal reflux and treatments (8 papers) and Dysphagia Assessment and Management (7 papers). Zachary M. Callahan collaborates with scholars based in United States, Japan and Italy. Zachary M. Callahan's co-authors include Michael Ujiki, Kristine Kuchta, Bailey Su, Stephanie Novak, JoAnn Carbray, John G. Linn, Stephen P. Haggerty, Woody Denham, Tetsuya Nakazato and Mikhail Attaar and has published in prestigious journals such as The American Journal of Surgery, Journal of the American College of Surgeons and Surgery.

In The Last Decade

Co-authorship network of co-authors of Zachary M. Callahan i

Fields of papers citing papers by Zachary M. Callahan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Zachary M. Callahan. 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 Zachary M. Callahan. The network helps show where Zachary M. Callahan may publish in the future.

Countries citing papers authored by Zachary M. Callahan

Since Specialization
Citations

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

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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2025