{"schema_version":"alpha-profile-public-v1","slug":"john-t-preston","canonical_url":"https://registry.alpha.ac/people/john-t-preston","as_of":"2026-09-21T16:01:42.330452+00:00","published_at":"2026-09-02T02:37:22.130941+00:00","last_reviewed_at":"2026-05-11T18:22:02.951+00:00","identity":{"display_name":"John T. Preston","headshot_url":null,"headshot_media":null,"profile_kind":"director","role_tags":["director","executive","board"],"current_role":{"company_name":"CLEAN HARBORS INC","company_slug":"clean-harbors-inc","exchange":"NYSE","ticker":"CLH","role_category":"director","title":"Director","committee":null,"is_board_chair":false,"is_independent":true,"valid_from":"1995-01-01","valid_to":null,"is_current":true,"verification_status":"confirmed","confidence":0.85,"evidence":{"source_type":"sec_proxy","source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","effective_date":"2026-04-10","last_checked_at":"2026-05-03T07:20:01.394+00:00"}},"photo_match":null},"assurance":{"is_claimed":false,"status":"unverified","assurance_level":null,"method":null,"verified_at":null,"expires_at":null},"claiming":{"eligible":true,"label":"Is this you? Claim your Alpha Profile","claim_url":"https://terminal.alpha.ac/claim-profile?person=john-t-preston","suggest_edit_label":"Suggest an edit","suggest_edit_url":"https://terminal.alpha.ac/claim-profile?person=john-t-preston&mode=suggest","canonical_record_will_be_reused":true,"canonical_facts_owner_controlled":false},"presentation":{"schema_version":"alpha-profile-presentation-v1","state":"alpha_editorial","version":0,"published_at":null,"headline":null,"headline_evidence":null,"location":null,"photo":null,"cover":null,"about":["Mr. Preston is the Managing Partner of TEM Capital, a private equity investment company, and previously served as Director of Technology Development at MIT and Director of the MIT Technology Licensing Office, where he was responsible for commercializing intellectual property. He has held director or advisory positions for the Governor of Massachusetts, the U.S. Department of Defense, NASA, and the National Technology Board of Singapore. He holds a Certificate in Cybersecurity Oversight from the National Association of Corporate Directors and Carnegie Mellon University."],"links":[],"sources":[],"featured":[],"competencies":[],"board_preferences":null,"board_service":[{"organization":"CLEAN HARBORS INC","organizationId":"clean-harbors-inc","title":"Director","period":"1995-01-01 · current","evidenceLabel":"sec_proxy","evidenceState":"verified","sourceUrl":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm"}],"experience":[],"education":[],"credentials":[],"section_order":null,"hidden_sections":[],"limitations":["Presentation fields do not alter independently verified Alpha Profile facts.","Owner-supplied résumé records retain their field-level evidence state.","Only confirmed company_person_roles with public evidence. Website governed_site_fallback rows are not invented. about/links are stored people.profile_summary/bio and linkedin_url only. Dates stay undisclosed when the role has no start_date. SoFi Bank is not SoFi Technologies."]},"presentation_authority":"confirmed_company_person_roles","roles":[{"company_name":"CLEAN HARBORS INC","company_slug":"clean-harbors-inc","exchange":"NYSE","ticker":"CLH","role_category":"director","title":"Director","committee":null,"is_board_chair":false,"is_independent":true,"valid_from":"1995-01-01","valid_to":null,"is_current":true,"verification_status":"confirmed","confidence":0.85,"evidence":{"source_type":"sec_proxy","source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","effective_date":"2026-04-10","last_checked_at":"2026-05-03T07:20:01.394+00:00"}}],"claims":[{"claim_type":"ai_ml_experience","claim_value":false,"claim_text":"Proxy extraction classified AI/ML experience for John T. Preston as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-11T18:22:03.110466+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"CLH DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-11T18:22:03.008361+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"ai_ml_experience","claim_value":false,"claim_text":"Executive extraction classified AI/ML experience for Jack Preston as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-05T01:04:38.092089+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"RH DEF 14A executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1528849/000110465926054988/rh-20260618xdef14a.htm","published_at":"2026-05-04T00:00:00+00:00","last_checked_at":"2026-05-05T01:04:37.878711+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"board_membership","claim_value":{"ticker":"CLH","role_type":"Director","organization":"Clean Harbors Inc"},"claim_text":"Serves on the board of Clean Harbors Inc as Director.","claim_state":"verified","valid_from":"1995-01-01","valid_to":null,"confidence":0.95,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-03T15:52:39.650397+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"Clean Harbors Inc director board source","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-03T15:52:22.19063+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"board_role","claim_value":"Director","claim_text":"John T. Preston currently serves as Director at Clean Harbors Inc.","claim_state":"verified","valid_from":"2026-04-10","valid_to":null,"confidence":0.92,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-11T18:22:03.073119+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"CLH DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-11T18:22:03.008361+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"committee_assignments","claim_value":["Nominating/Governance"],"claim_text":"John T. Preston serves on Nominating/Governance.","claim_state":"verified","valid_from":"2026-04-10","valid_to":null,"confidence":0.88,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-11T18:22:03.095477+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"CLH DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-11T18:22:03.008361+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"committee_assignments","claim_value":{"committees":["Nominating/Governance"]},"claim_text":"Committee assignments at Clean Harbors Inc: Nominating/Governance.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.95,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-03T15:52:39.650397+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"Clean Harbors Inc director board source","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-03T15:52:22.19063+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"current_executive_company","claim_value":"TEM Capital","claim_text":"John T. Preston is linked to TEM Capital as an operating executive.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.85,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-11T18:22:03.215822+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"CLH DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-11T18:22:03.008361+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"current_executive_role","claim_value":"Managing Partner","claim_text":"John T. Preston is also listed as Managing Partner.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.85,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-11T18:22:03.198192+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"CLH DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-11T18:22:03.008361+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"cybersecurity_experience","claim_value":true,"claim_text":"Proxy extraction classified cybersecurity experience for John T. Preston as true.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-11T18:22:03.145283+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"CLH DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-11T18:22:03.008361+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"cybersecurity_experience","claim_value":false,"claim_text":"Executive extraction classified cybersecurity experience for Jack Preston as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-05T01:04:38.136997+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"RH DEF 14A executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1528849/000110465926054988/rh-20260618xdef14a.htm","published_at":"2026-05-04T00:00:00+00:00","last_checked_at":"2026-05-05T01:04:37.878711+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"director_since","claim_value":{"start_date":null,"director_since":1995},"claim_text":"Director tenure at Clean Harbors Inc begins from 1995.","claim_state":"verified","valid_from":"1995-01-01","valid_to":null,"confidence":0.95,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-03T15:52:39.650397+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"Clean Harbors Inc director board source","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-03T15:52:22.19063+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"executive_company","claim_value":"RH","claim_text":"Jack Preston is associated with RH.","claim_state":"verified","valid_from":"2026-05-04","valid_to":null,"confidence":0.94,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-05T01:04:38.065367+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"RH DEF 14A executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1528849/000110465926054988/rh-20260618xdef14a.htm","published_at":"2026-05-04T00:00:00+00:00","last_checked_at":"2026-05-05T01:04:37.878711+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"executive_title","claim_value":"Chief Financial Officer","claim_text":"Jack Preston is listed as Chief Financial Officer at RH.","claim_state":"verified","valid_from":"2026-05-04","valid_to":null,"confidence":0.94,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-05T01:04:38.03748+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"RH DEF 14A executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1528849/000110465926054988/rh-20260618xdef14a.htm","published_at":"2026-05-04T00:00:00+00:00","last_checked_at":"2026-05-05T01:04:37.878711+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"independence_status","claim_value":{"is_independent":true},"claim_text":"Board independence status at Clean Harbors Inc: True.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.95,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-03T15:52:39.650397+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"Clean Harbors Inc director board source","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-03T15:52:22.19063+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"technology_background","claim_value":true,"claim_text":"Proxy extraction classified technology background for John T. Preston as true.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-11T18:22:03.127044+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"CLH DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","published_at":"2026-04-10T00:00:00+00:00","last_checked_at":"2026-05-11T18:22:03.008361+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"technology_background","claim_value":false,"claim_text":"Executive extraction classified technology background for Jack Preston as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-05T01:04:38.114375+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"RH DEF 14A executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1528849/000110465926054988/rh-20260618xdef14a.htm","published_at":"2026-05-04T00:00:00+00:00","last_checked_at":"2026-05-05T01:04:37.878711+00:00","relation":"supports","excerpt_locator":null}]},{"subject":"alpha:person:john-t-preston","claim_type":"board_service","claim_value":{"tags":[],"title":"Director","period":"1995-01-01 · current","organization":"CLEAN HARBORS INC","organization_id":"clean-harbors-inc"},"claim_text":"Director at CLEAN HARBORS INC (1995-01-01 · current)","valid_from":null,"valid_to":null,"verification_status":"confirmed","date_precision":"period_text_only","evidence":[{"source_url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","label":"sec_proxy","evidence_state":"verified"}],"claim_state":"confirmed","version":1}],"network":{"schema_version":"alpha-profile-network-public-v1","relationships":[],"relationship_pathfinding":false,"authentication_prompt":"Sign in to see how you're connected.","limitations":["Representative factual associations only.","Shared contexts do not assert personal acquaintance.","Anonymous graph traversal is not available."]},"permissions":{"classification":"open_public_projection","public_retrieval":true,"agent_retrieval":true,"redistribution":false,"model_training":false,"relationship_pathfinding":false,"direct_contact":false},"limitations":["Only permissioned public claims and evidence are included.","Absence of a claim is not evidence that the underlying fact is false.","Public retrieval does not grant model-training or redistribution rights.","Private relationships and Council activity are excluded."],"structured_data":{"@context":"https://schema.org","@type":"ProfilePage","@id":"https://registry.alpha.ac/people/john-t-preston#profile","url":"https://registry.alpha.ac/people/john-t-preston","dateModified":"2026-05-11T18:22:02.951+00:00","mainEntity":{"@type":"Person","@id":"https://registry.alpha.ac/people/john-t-preston#person","name":"John T. Preston","url":"https://registry.alpha.ac/people/john-t-preston","jobTitle":"Director","worksFor":{"@type":"Organization","name":"CLEAN HARBORS INC","tickerSymbol":"NYSE: CLH"},"affiliation":[{"@type":"OrganizationRole","roleName":"Director","startDate":"1995-01-01","memberOf":{"@type":"Organization","name":"CLEAN HARBORS INC","url":"https://registry.alpha.ac/companies/clean-harbors-inc","tickerSymbol":"NYSE: CLH"}}]},"isBasedOn":[{"@type":"CreativeWork","url":"https://www.sec.gov/Archives/edgar/data/822818/000082281826000013/clh-20260410.htm","name":"CLH DEF 14A director slate"},{"@type":"CreativeWork","url":"https://www.sec.gov/Archives/edgar/data/1528849/000110465926054988/rh-20260618xdef14a.htm","name":"RH DEF 14A executive officers"}],"mainEntityOfPage":"https://registry.alpha.ac/people/john-t-preston"},"trust":{"schema_version":"alpha-profile-trust-v1","verification":{"schema_version":"alpha-verification-states-v1","state":"corroborated","identity_ownership":"unclaimed","assurance_level":null,"claim_state_counts":{"source_reported":13,"corroborated":2,"alpha_verified":0,"disputed":0,"superseded":0},"derivation":"claim_states+identity_ownership","summary":"At least one published claim is corroborated by two or more public sources. Profile ownership is unclaimed."},"aggregation":{"schema_version":"alpha-claim-aggregation-v1","published_claim_count":15,"under_review_claim_count":0,"owner_supplied_claim_count":0,"evidence_record_count":5,"distinct_source_count":2,"conflicts":[{"claim_type":"cybersecurity_experience","kind":"extraction_disagreement","headline":false,"review_route":"internal_review","values":["false","true"],"publishers":["SEC EDGAR"],"source_types":["sec_filing"],"rationale":"Pipeline extraction runs disagree over documents from one publisher; routed to internal review, not headlined."},{"claim_type":"technology_background","kind":"extraction_disagreement","headline":false,"review_route":"internal_review","values":["false","true"],"publishers":["SEC EDGAR"],"source_types":["sec_filing"],"rationale":"Pipeline extraction runs disagree over documents from one publisher; routed to internal review, not headlined."}],"conflict_count":2,"headline_conflict_count":0,"internal_review_conflict_count":2,"contradiction_types":["cybersecurity_experience","technology_background"],"headline_conflict_types":[],"verification":{"schema_version":"alpha-verification-states-v1","state":"corroborated","identity_ownership":"unclaimed","assurance_level":null,"claim_state_counts":{"source_reported":13,"corroborated":2,"alpha_verified":0,"disputed":0,"superseded":0},"derivation":"claim_states+identity_ownership","summary":"At least one published claim is corroborated by two or more public sources. Profile ownership is unclaimed."},"coverage":{"schema_version":"alpha-coverage-metric-v1","published_claims":15,"corroborated_claims":2,"sources":5,"distinct_sources":2,"role_claims":1,"last_reviewed_at":"2026-05-11T18:22:02.951+00:00","observed_at":"2026-09-21T16:01:42.330452+00:00","freshness_days":133}},"rights":{"public_retrieval":"allowed","agent_retrieval":"allowed","redistribution":"not_granted","model_training":"not_granted","commercial_use":"not_specified","relationship_pathfinding":"not_granted","direct_contact":"not_granted"}},"projection":{"schema_version":"alpha-profile-projection-v5","entity":{"kind":"person","slug":"john-t-preston","canonical_url":"https://registry.alpha.ac/people/john-t-preston"},"publication":{"published_at":"2026-09-02T02:37:22.130941+00:00","last_reviewed_at":"2026-05-11T18:22:02.951+00:00","as_of":"2026-09-21T16:01:42.330452+00:00"},"representations":{"html":{"href":"https://registry.alpha.ac/people/john-t-preston","media_type":"text/html"},"json":{"href":"https://registry.alpha.ac/api/public/profiles/john-t-preston","media_type":"application/json"},"markdown":{"href":"https://registry.alpha.ac/people/john-t-preston.md","media_type":"text/markdown"},"structured_data":{"embedded":true,"media_type":"application/ld+json"},"share_image":null},"permissions":{"public_retrieval":true,"agent_retrieval":true,"redistribution":false,"model_training":false,"relationship_pathfinding":false,"direct_contact":false}}}