Alex J. Callahan

532 total citations
9 papers, 344 citations indexed

About

Alex J. Callahan is a scholar working on Molecular Biology, Radiology, Nuclear Medicine and Imaging and Organic Chemistry. According to data from OpenAlex, Alex J. Callahan has authored 9 papers receiving a total of 344 indexed citations (citations by other indexed papers that have themselves been cited), including 8 papers in Molecular Biology, 3 papers in Radiology, Nuclear Medicine and Imaging and 1 paper in Organic Chemistry. Recurrent topics in Alex J. Callahan's work include Chemical Synthesis and Analysis (4 papers), Monoclonal and Polyclonal Antibodies Research (3 papers) and Advanced biosensing and bioanalysis techniques (3 papers). Alex J. Callahan is often cited by papers focused on Chemical Synthesis and Analysis (4 papers), Monoclonal and Polyclonal Antibodies Research (3 papers) and Advanced biosensing and bioanalysis techniques (3 papers). Alex J. Callahan collaborates with scholars based in United States, Taiwan and Italy. Alex J. Callahan's co-authors include Bradley L. Pentelute, Andrei Loas, Alexander J. Mijalis, Nina Hartrampf, Carly K. Schissel, Mark D. Simon, Stephanie Hanna, Anthony J. Quartararo, Azin Saebi and Zachary P. Gates and has published in prestigious journals such as Science, Journal of the American Chemical Society and Nature Communications.

In The Last Decade

Alex J. Callahan

8 papers receiving 338 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Alex J. Callahan United States	5	272	116	72	49	26	9	344
Mackenzie Poskus United States	3	234 0.9×	99 0.9×	70 1.0×	43 0.9×	23 0.9×	3	302
Carly K. Schissel United States	11	395 1.5×	153 1.3×	82 1.1×	61 1.2×	47 1.8×	17	489
Jordi C. J. Hintzen Denmark	12	379 1.4×	156 1.3×	41 0.6×	42 0.9×	32 1.2×	30	492
Stijn M. Agten Netherlands	11	172 0.6×	93 0.8×	27 0.4×	40 0.8×	9 0.3×	18	281
Leila Malik Denmark	8	286 1.1×	148 1.3×	24 0.3×	31 0.6×	42 1.6×	12	368
Baptiste Thomas France	14	387 1.4×	276 2.4×	35 0.5×	76 1.6×	12 0.5×	19	456
Daxian Shan United States	7	291 1.1×	110 0.9×	27 0.4×	75 1.5×	10 0.4×	10	407
Rebecca L. Holden United States	9	222 0.8×	36 0.3×	41 0.6×	35 0.7×	47 1.8×	14	323
Lisa E. Prevette United States	11	489 1.8×	117 1.0×	42 0.6×	17 0.3×	9 0.3×	12	591
William Shu Ching Ngai China	7	304 1.1×	285 2.5×	42 0.6×	94 1.9×	9 0.3×	13	404

Countries citing papers authored by Alex J. Callahan

Since Specialization

Citations

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

Fields of papers citing papers by Alex J. Callahan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Alex J. Callahan

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

All Works

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9 of 9 papers shown

Yeşilçimen, Ahmet, et al.. (2025). Chemical Synthesis, Refolding, and Characterization of Mirror-Image Cyclophilin A. The Journal of Organic Chemistry. 90(9). 3365–3372.

Fittolani, Giulio, Alex J. Callahan, Andrei Loas, & Bradley L. Pentelute. (2025). Automated fast-flow synthesis of the immune checkpoint receptors PD-1 and PD-L1. Chemical Communications. 61(29). 5471–5474. 3 indexed citations

Callahan, Alex J., et al.. (2024). Same Day Access to Folded Synthetic Proteins. Journal of the American Chemical Society. 146(42). 28696–28706. 2 indexed citations

Yeşilçimen, Ahmet, et al.. (2024). Rapid Production of Native and Mirror-Image Tumor Necrosis Factor-α Enabled by Automated Flow Peptide Synthesis Technology. The Journal of Organic Chemistry. 89(18). 12886–12893. 3 indexed citations

Callahan, Alex J., Stephanie Hanna, Yen‐Chun Lee, et al.. (2024). Mirror-image ligand discovery enabled by single-shot fast-flow synthesis of D-proteins. Nature Communications. 15(1). 1813–1813. 28 indexed citations

Li, Chengxi, Somesh Mohapatra, Alex J. Callahan, et al.. (2022). Machine Learning Guides Peptide Nucleic Acid Flow Synthesis and Sequence Design. Advanced Science. 9(34). e2201988–e2201988. 10 indexed citations

Li, Chengxi, Alex J. Callahan, Mark D. Simon, et al.. (2021). Fully automated fast-flow synthesis of antisense phosphorodiamidate morpholino oligomers. Nature Communications. 12(1). 4396–4396. 35 indexed citations

Li, Chengxi, Alex J. Callahan, Bryan H. Bellaire, et al.. (2021). Automated Flow Synthesis of Peptide–PNA Conjugates. ACS Central Science. 8(2). 205–213. 24 indexed citations

Hartrampf, Nina, Azin Saebi, Mackenzie Poskus, et al.. (2020). Synthesis of proteins by automated flow chemistry. Science. 368(6494). 980–987. 239 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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