Thomas Ullman

10.6k total citations · 3 hit papers
129 papers, 6.3k citations indexed

About

Thomas Ullman is a scholar working on Genetics, Epidemiology and Surgery. According to data from OpenAlex, Thomas Ullman has authored 129 papers receiving a total of 6.3k indexed citations (citations by other indexed papers that have themselves been cited), including 95 papers in Genetics, 76 papers in Epidemiology and 29 papers in Surgery. Recurrent topics in Thomas Ullman's work include Inflammatory Bowel Disease (95 papers), Microscopic Colitis (71 papers) and Colorectal Cancer Screening and Detection (19 papers). Thomas Ullman is often cited by papers focused on Inflammatory Bowel Disease (95 papers), Microscopic Colitis (71 papers) and Colorectal Cancer Screening and Detection (19 papers). Thomas Ullman collaborates with scholars based in United States, Canada and United Kingdom. Thomas Ullman's co-authors include Steven H. Itzkowitz, Noam Harpaz, María T. Abreu, Asher Kornbluth, Carol Bodian, Paul Moayyedi, Nicholas J. Talley, David T. Rubin, Victoria Croog and Sierra Matula and has published in prestigious journals such as SHILAP Revista de lepidopterología, Gastroenterology and Gut.

In The Last Decade

Thomas Ullman

127 papers receiving 6.2k citations

Hit Papers

align trajectories sort by overperformance

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.

Intestinal Inflammation and Cancer

2011 876 citations Thomas Ullman, Steven H. Itzkowitz Gastroenterology profile →
Histologic Inflammation Is a Risk Factor for Progression to Colorectal Neoplasia in Ulcerative Colitis: A Cohort Study

2007 572 citations Noam Harpaz, Steven H. Itzkowitz et al. Gastroenterology profile →
Appropriate Therapeutic Drug Monitoring of Biologic Agents for Patients With Inflammatory Bowel Diseases

2019 228 citations Gil Melmed, Thomas Ullman et al. Clinical Gastroenterology and Hepatology profile →

Author Peers

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

Author						Papers	Cites
Thomas Ullman	3.9k	2.8k	1.7k	1.4k	993	129	6.3k
Bas Oldenburg	4.2k 1.1×	3.3k 1.2×	2.5k 1.5×	1.8k 1.3×	939 0.9×	208	7.7k
Pieter Stokkers	4.0k 1.0×	2.5k 0.9×	2.2k 1.3×	1.0k 0.8×	1.4k 1.4×	133	6.4k
Daan W. Hommes	3.8k 1.0×	2.5k 0.9×	1.9k 1.1×	1.1k 0.8×	1.5k 1.6×	97	7.1k
Livia Biancone	4.0k 1.0×	2.8k 1.0×	1.9k 1.1×	782 0.6×	1.9k 1.9×	199	6.9k
Pia Munkholm	3.9k 1.0×	2.8k 1.0×	1.8k 1.0×	818 0.6×	669 0.7×	72	5.3k
Fernando Magro	5.5k 1.4×	4.2k 1.5×	2.4k 1.4×	786 0.6×	1.5k 1.5×	307	8.6k
Miquel Sans	3.2k 0.8×	2.2k 0.8×	1.8k 1.0×	635 0.5×	1.2k 1.2×	109	6.0k
Brian Bressler	4.5k 1.1×	3.8k 1.4×	2.2k 1.3×	1.2k 0.9×	1.9k 1.9×	237	7.8k
Pia Munkholm	5.3k 1.4×	4.0k 1.5×	2.5k 1.4×	608 0.4×	842 0.8×	110	7.2k
Johan Burisch	5.1k 1.3×	3.6k 1.3×	2.2k 1.3×	643 0.5×	991 1.0×	233	7.6k

Countries citing papers authored by Thomas Ullman

Since Specialization

Citations

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

Fields of papers citing papers by Thomas Ullman

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Thomas Ullman. 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 Thomas Ullman. The network helps show where Thomas Ullman may publish in the future.

Co-authorship network of co-authors of Thomas Ullman

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

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Ullman, Thomas, et al.. (2025). Culturally Informed Digital Behavioral Intervention Development for Inflammatory Bowel Disease: A Qualitative Study. Inflammatory Bowel Diseases. 31(12). 3271–3278.

Shah, Shailja C., Joana Torres, Daniel Castañeda, et al.. (2019). Association Between Indefinite Dysplasia and Advanced Neoplasia in Patients With Inflammatory Bowel Diseases Undergoing Surveillance. Clinical Gastroenterology and Hepatology. 18(7). 1518–1527.e3. 24 indexed citations

Shah, Shailja C., Joren R. ten Hove, Daniel Castañeda, et al.. (2018). High Risk of Advanced Colorectal Neoplasia in Patients With Primary Sclerosing Cholangitis Associated With Inflammatory Bowel Disease. Clinical Gastroenterology and Hepatology. 16(7). 1106–1113.e3. 73 indexed citations

Shah, Shailja C., Joren R. ten Hove, Joana Torres, et al.. (2018). No Association Between Pseudopolyps and Colorectal Neoplasia in Patients With Inflammatory Bowel Diseases. Gastroenterology. 156(5). 1333–1344.e3. 54 indexed citations

Tang, Mei San, Rowann Bowcutt, Jacqueline M. Leung, et al.. (2017). Integrated Analysis of Biopsies from Inflammatory Bowel Disease Patients Identifies SAA1 as a Link Between Mucosal Microbes with TH17 and TH22 Cells. Inflammatory Bowel Diseases. 23(9). 1544–1554. 30 indexed citations

Hu, Jianzhong, Justin Côté-Daigneault, Hina Panchal, et al.. (2016). P735. Exploring mechanisms of inflammatory bowel disease transmission in utero through the microbiome: the MECONIUM Study Pilot. Journal of Crohn s and Colitis. 10(suppl 1). S482–S483. 1 indexed citations

Atreja, Ashish, Eva Szigethy, Jean‐Frédéric Colombel, et al.. (2016). P-063 Psychosocial Burden Among Patients with IBD. Inflammatory Bowel Diseases. 22. S29–S29. 1 indexed citations

Torres, Joana, Xiuliang Bao, Alina C. Iuga, et al.. (2013). Farnesoid X Receptor Expression Is Decreased in Colonic Mucosa of Patients with Primary Sclerosing Cholangitis and Colitis-associated Neoplasia. Inflammatory Bowel Diseases. 19(2). 275–282. 45 indexed citations

Melmed, Gil, Corey A. Siegel, Brennan Spiegel, et al.. (2013). Quality Indicators for Inflammatory Bowel Disease. Inflammatory Bowel Diseases. 19(3). 662–668. 110 indexed citations

10.

Colombel, Jean‐Frédéric, et al.. (2013). The management of immunosuppression in patients with inflammatory bowel disease and cancer. Gut. 62(11). 1523–1528. 43 indexed citations

11.

Talley, Nicholas J., María T. Abreu, Jean-Paul Achkar, et al.. (2011). An Evidence-Based Systematic Review on Medical Therapies for Inflammatory Bowel Disease. The American Journal of Gastroenterology. 106. S2–S25. 229 indexed citations

12.

Kappelman, Michael D., Erzsébet Horváth–Puhó, Robert S. Sandler, et al.. (2011). Thromboembolic risk among Danish children and adults with inflammatory bowel diseases: a population-based nationwide study. Gut. 60(7). 937–943. 226 indexed citations

13.

Park, Seung‐Yeol, Seon-Joo Yoon, Yeon‐Tae Jeong, et al.. (2009). N-Glycosylation Status of Beta-Haptoglobin in Sera of Patients with Colon Cancer, Chronic Inflammatory Diseases, and Normal Subjects. Glycobiology. 19. 113. 12 indexed citations

14.

Park, Seung‐Yeol, Yeon‐Tae Jeong, Jin‐Man Kim, et al.. (2009). N‐glycosylation status of β‐haptoglobin in sera of patients with colon cancer, chronic inflammatory diseases and normal subjects. International Journal of Cancer. 126(1). 142–155. 48 indexed citations

15.

Sachar, David B., Eric R. Lemmer, Yair Edden, et al.. (2009). Recurrence patterns after first resection for stricturing or penetrating Crohnʼs disease. Inflammatory Bowel Diseases. 15(7). 1071–1075. 53 indexed citations

16.

Lazarev, Mark, Thomas Ullman, Wolfgang H. Schraut, et al.. (2009). Small bowel resection rates in Crohnʼs disease and the indication for surgery over time: Experience from a large tertiary care center. Inflammatory Bowel Diseases. 16(5). 830–835. 72 indexed citations

17.

Marion, James F., Jerome D. Waye, Daniel H. Present, et al.. (2008). Chromoendoscopy-Targeted Biopsies Are Superior to Standard Colonoscopic Surveillance for Detecting Dysplasia in Inflammatory Bowel Disease Patients: A Prospective Endoscopic Trial. The American Journal of Gastroenterology. 103(9). 2342–2349. 215 indexed citations

18.

Ullman, Thomas, Robert D. Odze, & Francis A. Farraye. (2008). Diagnosis and management of dysplasia in patients with ulcerative colitis and Crohnʼs disease of the colon. Inflammatory Bowel Diseases. 15(4). 630–638. 92 indexed citations

19.

Harpaz, Noam, Steven H. Itzkowitz, Sabera Hossain, et al.. (2007). Histologic Inflammation Is a Risk Factor for Progression to Colorectal Neoplasia in Ulcerative Colitis: A Cohort Study. Gastroenterology. 133(4). 1099–1105. 572 indexed citations breakdown →

20.

Muschler, George F., et al.. (1993). Evaluation of bone‐grafting materials in a new canine segmental spinal fusion model. Journal of Orthopaedic Research®. 11(4). 514–524. 55 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.

Explore authors with similar magnitude of impact