{"schema_version":"alpha-profile-public-v1","slug":"mark-j-duff","canonical_url":"https://registry.alpha.ac/people/mark-j-duff","as_of":"2026-10-24T17:53:41.072727+00:00","published_at":"2026-09-02T02:37:22.304663+00:00","last_reviewed_at":"2026-05-16T06:48:56.162+00:00","identity":{"display_name":"Mark Duff","headshot_url":null,"headshot_media":null,"profile_kind":"director","role_tags":["director","executive"],"current_role":{"company_name":"PERMA FIX ENVIRONMENTAL SERVICES INC","company_slug":"perma-fix-environmental-services-inc","exchange":"NASDAQ","ticker":"PESI","role_category":"director","title":"Director","committee":null,"is_board_chair":false,"is_independent":false,"valid_from":"2023-01-01","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/891532/000164117225014471/formdef14a.htm","effective_date":"2025-06-10","last_checked_at":"2026-04-28T23:12:01.171+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=mark-j-duff","suggest_edit_label":"Suggest an edit","suggest_edit_url":"https://terminal.alpha.ac/claim-profile?person=mark-j-duff&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. Duff has served as President and CEO of Perma-Fix since September 2017 and joined the Board in April 2023. He brings over 40 years of management and technical experience in DOE and DOD environmental and construction markets, including roles as corporate officer, senior project manager, and federal employee. He has successfully implemented strategies for facility upgrades and market expansion."],"links":[],"sources":[],"featured":[],"competencies":[],"board_preferences":null,"board_service":[{"organization":"PERMA FIX ENVIRONMENTAL SERVICES INC","organizationId":"perma-fix-environmental-services-inc","title":"Director","period":"2023-01-01 · current","evidenceLabel":"sec_proxy","evidenceState":"verified","sourceUrl":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.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":"PERMA FIX ENVIRONMENTAL SERVICES INC","company_slug":"perma-fix-environmental-services-inc","exchange":"NASDAQ","ticker":"PESI","role_category":"director","title":"Director","committee":null,"is_board_chair":false,"is_independent":false,"valid_from":"2023-01-01","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/891532/000164117225014471/formdef14a.htm","effective_date":"2025-06-10","last_checked_at":"2026-04-28T23:12:01.171+00:00"}}],"claims":[{"claim_type":"ai_ml_experience","claim_value":false,"claim_text":"Proxy extraction classified AI/ML experience for Mark J. Duff as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:50:02.204629+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","published_at":"2025-06-10T00:00:00+00:00","last_checked_at":"2026-05-16T01:50:02.073562+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"ai_ml_experience","claim_value":false,"claim_text":"Executive extraction classified AI/ML experience for Mark Duff as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T06:48:56.436605+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI 10-K executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000149315226012314/form10-k.htm","published_at":"2026-03-24T00:00:00+00:00","last_checked_at":"2026-05-16T06:48:56.252901+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"board_role","claim_value":"Director","claim_text":"Mark J. Duff currently serves as Director at PERMA FIX ENVIRONMENTAL SERVICES INC.","claim_state":"verified","valid_from":"2025-06-10","valid_to":null,"confidence":0.92,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:50:02.169773+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","published_at":"2025-06-10T00:00:00+00:00","last_checked_at":"2026-05-16T01:50:02.073562+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"committee_assignments","claim_value":[],"claim_text":"Mark J. Duff serves on no disclosed committees.","claim_state":"verified","valid_from":"2025-06-10","valid_to":null,"confidence":0.88,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:50:02.187922+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","published_at":"2025-06-10T00:00:00+00:00","last_checked_at":"2026-05-16T01:50:02.073562+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"current_executive_company","claim_value":"Perma-Fix Environmental Services, Inc.","claim_text":"Mark J. Duff is linked to Perma-Fix Environmental Services, Inc. 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":"2026-05-16T01:50:02.315015+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","published_at":"2025-06-10T00:00:00+00:00","last_checked_at":"2026-05-16T01:50:02.073562+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"current_executive_role","claim_value":"President and Chief Executive Officer","claim_text":"Mark J. Duff is also listed as President and Chief Executive Officer.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.85,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:50:02.299072+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","published_at":"2025-06-10T00:00:00+00:00","last_checked_at":"2026-05-16T01:50:02.073562+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"cybersecurity_experience","claim_value":false,"claim_text":"Proxy extraction classified cybersecurity experience for Mark J. Duff as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:50:02.239751+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","published_at":"2025-06-10T00:00:00+00:00","last_checked_at":"2026-05-16T01:50:02.073562+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"cybersecurity_experience","claim_value":false,"claim_text":"Executive extraction classified cybersecurity experience for Mark Duff as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T06:48:56.476479+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI 10-K executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000149315226012314/form10-k.htm","published_at":"2026-03-24T00:00:00+00:00","last_checked_at":"2026-05-16T06:48:56.252901+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"executive_company","claim_value":"PERMA FIX ENVIRONMENTAL SERVICES INC","claim_text":"Mark Duff is associated with PERMA FIX ENVIRONMENTAL SERVICES INC.","claim_state":"verified","valid_from":"2026-03-24","valid_to":null,"confidence":0.94,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T06:48:56.408755+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI 10-K executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000149315226012314/form10-k.htm","published_at":"2026-03-24T00:00:00+00:00","last_checked_at":"2026-05-16T06:48:56.252901+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"executive_title","claim_value":"President and Chief Executive Officer","claim_text":"Mark Duff is listed as President and Chief Executive Officer at PERMA FIX ENVIRONMENTAL SERVICES INC.","claim_state":"verified","valid_from":"2026-03-24","valid_to":null,"confidence":0.94,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T06:48:56.385563+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI 10-K executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000149315226012314/form10-k.htm","published_at":"2026-03-24T00:00:00+00:00","last_checked_at":"2026-05-16T06:48:56.252901+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"technology_background","claim_value":false,"claim_text":"Proxy extraction classified technology background for Mark J. Duff as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:50:02.222026+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","published_at":"2025-06-10T00:00:00+00:00","last_checked_at":"2026-05-16T01:50:02.073562+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"technology_background","claim_value":false,"claim_text":"Executive extraction classified technology background for Mark Duff as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T06:48:56.45637+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"PESI 10-K executive officers","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/891532/000149315226012314/form10-k.htm","published_at":"2026-03-24T00:00:00+00:00","last_checked_at":"2026-05-16T06:48:56.252901+00:00","relation":"supports","excerpt_locator":null}]},{"subject":"alpha:person:mark-j-duff","claim_type":"board_service","claim_value":{"tags":[],"title":"Director","period":"2023-01-01 · current","organization":"PERMA FIX ENVIRONMENTAL SERVICES INC","organization_id":"perma-fix-environmental-services-inc"},"claim_text":"Director at PERMA FIX ENVIRONMENTAL SERVICES INC (2023-01-01 · 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/891532/000164117225014471/formdef14a.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/mark-j-duff#profile","url":"https://registry.alpha.ac/people/mark-j-duff","dateModified":"2026-05-16T06:48:56.162+00:00","mainEntity":{"@type":"Person","@id":"https://registry.alpha.ac/people/mark-j-duff#person","name":"Mark Duff","url":"https://registry.alpha.ac/people/mark-j-duff","jobTitle":"Director","worksFor":{"@type":"Organization","name":"PERMA FIX ENVIRONMENTAL SERVICES INC","tickerSymbol":"NASDAQ: PESI"},"affiliation":[{"@type":"OrganizationRole","roleName":"Director","startDate":"2023-01-01","memberOf":{"@type":"Organization","name":"PERMA FIX ENVIRONMENTAL SERVICES INC","url":"https://registry.alpha.ac/companies/perma-fix-environmental-services-inc","tickerSymbol":"NASDAQ: PESI"}}]},"isBasedOn":[{"@type":"CreativeWork","url":"https://www.sec.gov/Archives/edgar/data/891532/000164117225014471/formdef14a.htm","name":"PESI DEF 14A director slate"},{"@type":"CreativeWork","url":"https://www.sec.gov/Archives/edgar/data/891532/000149315226012314/form10-k.htm","name":"PESI 10-K executive officers"}],"mainEntityOfPage":"https://registry.alpha.ac/people/mark-j-duff"},"registry_intelligence":{"schema_version":"alpha-registry-intelligence-v1","record_version":"d751713988987e9331980363e24189ce","subject":"alpha:person:mark-j-duff","as_of":"2026-10-24T17:53:41.317648+00:00","recorded_at":"2026-10-24T17:53:41.317648+00:00","availability":"available","records":[],"next_offset":null,"limitations":["Only explicitly published, rights-cleared records. Missing records do not establish absence, safety, or complete coverage."]},"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":4,"corroborated":5,"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":9,"under_review_claim_count":0,"owner_supplied_claim_count":0,"evidence_record_count":4,"distinct_source_count":2,"conflicts":[],"conflict_count":0,"headline_conflict_count":0,"internal_review_conflict_count":0,"contradiction_types":[],"headline_conflict_types":[],"verification":{"schema_version":"alpha-verification-states-v1","state":"corroborated","identity_ownership":"unclaimed","assurance_level":null,"claim_state_counts":{"source_reported":4,"corroborated":5,"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":9,"corroborated_claims":5,"sources":4,"distinct_sources":2,"role_claims":1,"last_reviewed_at":"2026-05-16T06:48:56.162+00:00","observed_at":"2026-10-24T17:53:41.072727+00:00","freshness_days":161}},"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":"mark-j-duff","canonical_url":"https://registry.alpha.ac/people/mark-j-duff"},"publication":{"published_at":"2026-09-02T02:37:22.304663+00:00","last_reviewed_at":"2026-05-16T06:48:56.162+00:00","as_of":"2026-10-24T17:53:41.072727+00:00"},"representations":{"html":{"href":"https://registry.alpha.ac/people/mark-j-duff","media_type":"text/html"},"json":{"href":"https://registry.alpha.ac/api/public/profiles/mark-j-duff","media_type":"application/json"},"markdown":{"href":"https://registry.alpha.ac/people/mark-j-duff.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}}}