{"id":"https://openalex.org/A5111466869","orcid":null,"observed_orcids":[],"display_name":"Clarence A. Callahan","raw_author_names":["CALLAHAN, CLARENCE ARTHUR","Clarence A. Callahan"],"full_name":"Clarence A. Callahan","works_count":8,"cited_by_count":232,"summary_stats":{"2yr_mean_citedness":0.0,"h_index":6,"i10_index":6},"ids":{"openalex":"https://openalex.org/A5111466869","orcid":null,"observed_orcids":[]},"affiliations":[{"institution":{"id":"https://openalex.org/I1302368450","ror":"https://ror.org/03tns0030","display_name":"Environmental Protection Agency","country_code":"US","type":"government","lineage":["https://openalex.org/I1302368450"]},"years":[1992,1991,1990,1987,1984]}],"last_known_institutions":null,"topics":[{"id":"https://openalex.org/T10447","display_name":"Environmental Toxicology and Ecotoxicology","count":6,"subfield":{"id":"https://openalex.org/subfields/2307","display_name":"Health, Toxicology and Mutagenesis"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10122","display_name":"Toxic Organic Pollutants Impact","count":4,"subfield":{"id":"https://openalex.org/subfields/2307","display_name":"Health, Toxicology and Mutagenesis"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11180","display_name":"Pesticide and Herbicide Environmental Studies","count":3,"subfield":{"id":"https://openalex.org/subfields/2310","display_name":"Pollution"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10875","display_name":"Pesticide Exposure and Toxicity","count":2,"subfield":{"id":"https://openalex.org/subfields/3005","display_name":"Toxicology"},"field":{"id":"https://openalex.org/fields/30","display_name":"Pharmacology, Toxicology and Pharmaceutics"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10236","display_name":"Aquatic Ecosystems and Phytoplankton Dynamics","count":1,"subfield":{"id":"https://openalex.org/subfields/2304","display_name":"Environmental Chemistry"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"topic_share":[{"id":"https://openalex.org/T13563","display_name":"Chemical Analysis and Environmental Impact","value":7.38e-05,"subfield":{"id":"https://openalex.org/subfields/2307","display_name":"Health, Toxicology and Mutagenesis"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T14106","display_name":"Environmental and Sediment Control","value":1.83e-05,"subfield":{"id":"https://openalex.org/subfields/2308","display_name":"Management, Monitoring, Policy and Law"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10122","display_name":"Toxic Organic Pollutants Impact","value":1.4e-05,"subfield":{"id":"https://openalex.org/subfields/2307","display_name":"Health, Toxicology and Mutagenesis"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10447","display_name":"Environmental Toxicology and Ecotoxicology","value":1.09e-05,"subfield":{"id":"https://openalex.org/subfields/2307","display_name":"Health, Toxicology and Mutagenesis"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11180","display_name":"Pesticide and Herbicide Environmental Studies","value":1.06e-05,"subfield":{"id":"https://openalex.org/subfields/2310","display_name":"Pollution"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"x_concepts":[{"id":"18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","score":0.6276000142097473},{"id":"86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","score":0.5542556047439575},{"id":"107872376","wikidata":"https://www.wikidata.org/wiki/Q321355","display_name":"Environmental chemistry","score":0.4917762577533722},{"id":"185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","score":0.43116873502731323},{"id":"178790620","wikidata":"https://www.wikidata.org/wiki/Q11351","display_name":"Organic chemistry","score":0.0}],"counts_by_year":[{"year":1976,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1978,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1984,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1987,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1990,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1991,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1992,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1998,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2012,"works_count":0,"oa_works_count":0,"cited_by_count":6},{"year":2013,"works_count":0,"oa_works_count":0,"cited_by_count":5},{"year":2014,"works_count":0,"oa_works_count":0,"cited_by_count":5},{"year":2015,"works_count":0,"oa_works_count":0,"cited_by_count":5},{"year":2016,"works_count":0,"oa_works_count":0,"cited_by_count":8},{"year":2017,"works_count":0,"oa_works_count":0,"cited_by_count":1},{"year":2018,"works_count":0,"oa_works_count":0,"cited_by_count":2},{"year":2019,"works_count":0,"oa_works_count":0,"cited_by_count":4},{"year":2020,"works_count":0,"oa_works_count":0,"cited_by_count":7},{"year":2021,"works_count":0,"oa_works_count":0,"cited_by_count":4},{"year":2022,"works_count":0,"oa_works_count":0,"cited_by_count":7},{"year":2023,"works_count":0,"oa_works_count":0,"cited_by_count":3},{"year":2024,"works_count":0,"oa_works_count":0,"cited_by_count":4},{"year":2026,"works_count":0,"oa_works_count":0,"cited_by_count":1}],"display_name_alternatives":["CALLAHAN, CLARENCE ARTHUR","Clarence A. Callahan"],"block_key":"c callahan","works_api_url":"https://api.openalex.org/works?filter=author.id:A5111466869","awards_count":0,"awards_api_url":"https://api.openalex.org/awards?filter=investigators.author.id:A5111466869","updated_date":"2026-11-10T14:30:39","created_date":"2016-06-24T00:00:00"}