{"schema_version":"alpha-profile-public-v1","slug":"william-heiden","canonical_url":"https://registry.alpha.ac/people/william-heiden","as_of":"2026-09-21T22:34:06.453387+00:00","published_at":"2026-09-02T02:37:20.075967+00:00","last_reviewed_at":"2026-05-16T01:07:52.169+00:00","identity":{"display_name":"William Heiden","headshot_url":null,"headshot_media":null,"profile_kind":"director","role_tags":["director"],"current_role":{"company_name":"MACROGENICS INC","company_slug":"macrogenics-inc","exchange":"NASDAQ","ticker":"MGNX","role_category":"director","title":"Director","committee":null,"is_board_chair":false,"is_independent":true,"valid_from":"2022-01-01","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/1125345/000112534526000021/mgnx-20260407.htm","effective_date":"2026-04-08","last_checked_at":"2026-04-24T23:48:01.158+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=william-heiden","suggest_edit_label":"Suggest an edit","suggest_edit_url":"https://terminal.alpha.ac/claim-profile?person=william-heiden&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. Heiden has served as Board Chair since May 2022 and brings over 35 years of biotechnology and pharmaceutical industry experience. He most recently served as President and CEO of AMAG Pharmaceuticals from 2012 to 2020. He previously led Genzyme Transgenics Company, Elixir Pharmaceuticals, and Praecis Pharmaceuticals, and held various positions at Schering-Plough Corporation."],"links":[],"sources":[],"featured":[],"competencies":[],"board_preferences":null,"board_service":[{"organization":"MACROGENICS INC","organizationId":"macrogenics-inc","title":"Director","period":"2022-01-01 · current","evidenceLabel":"sec_proxy","evidenceState":"verified","sourceUrl":"https://www.sec.gov/Archives/edgar/data/1125345/000112534526000021/mgnx-20260407.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":"MACROGENICS INC","company_slug":"macrogenics-inc","exchange":"NASDAQ","ticker":"MGNX","role_category":"director","title":"Director","committee":null,"is_board_chair":false,"is_independent":true,"valid_from":"2022-01-01","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/1125345/000112534526000021/mgnx-20260407.htm","effective_date":"2026-04-08","last_checked_at":"2026-04-24T23:48:01.158+00:00"}}],"claims":[{"claim_type":"ai_ml_experience","claim_value":false,"claim_text":"Proxy extraction classified AI/ML experience for William Heiden as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:07:52.321881+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"MGNX DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534526000021/mgnx-20260407.htm","published_at":"2026-04-08T00:00:00+00:00","last_checked_at":"2026-05-16T01:07:52.220957+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"board_role","claim_value":"Chair","claim_text":"William Heiden currently serves as Chair at MACROGENICS INC.","claim_state":"verified","valid_from":"2026-04-08","valid_to":null,"confidence":0.92,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:07:52.28815+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"MGNX DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534526000021/mgnx-20260407.htm","published_at":"2026-04-08T00:00:00+00:00","last_checked_at":"2026-05-16T01:07:52.220957+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"committee_assignments","claim_value":["Audit"],"claim_text":"William Heiden serves on Audit.","claim_state":"verified","valid_from":"2026-04-08","valid_to":null,"confidence":0.88,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:07:52.305395+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"MGNX DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534526000021/mgnx-20260407.htm","published_at":"2026-04-08T00:00:00+00:00","last_checked_at":"2026-05-16T01:07:52.220957+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"cybersecurity_experience","claim_value":false,"claim_text":"Proxy extraction classified cybersecurity experience for William Heiden as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:07:52.355377+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"MGNX DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534526000021/mgnx-20260407.htm","published_at":"2026-04-08T00:00:00+00:00","last_checked_at":"2026-05-16T01:07:52.220957+00:00","relation":"supports","excerpt_locator":null}]},{"claim_type":"technology_background","claim_value":false,"claim_text":"Proxy extraction classified technology background for William Heiden as false.","claim_state":"verified","valid_from":null,"valid_to":null,"confidence":0.72,"source_tier":3,"verification_status":"confirmed","last_reviewed_at":"2026-05-16T01:07:52.338962+00:00","version":1,"evidence":[{"source_name":"SEC EDGAR","document_title":"MGNX DEF 14A director slate","source_type":"sec_filing","source_tier":3,"source_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534526000021/mgnx-20260407.htm","published_at":"2026-04-08T00:00:00+00:00","last_checked_at":"2026-05-16T01:07:52.220957+00:00","relation":"supports","excerpt_locator":null}]},{"subject":"alpha:person:william-heiden","claim_type":"board_service","claim_value":{"tags":[],"title":"Director","period":"2022-01-01 · current","organization":"MACROGENICS INC","organization_id":"macrogenics-inc"},"claim_text":"Director at MACROGENICS INC (2022-01-01 · 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/1125345/000112534526000021/mgnx-20260407.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/william-heiden#profile","url":"https://registry.alpha.ac/people/william-heiden","dateModified":"2026-05-16T01:07:52.169+00:00","mainEntity":{"@type":"Person","@id":"https://registry.alpha.ac/people/william-heiden#person","name":"William Heiden","url":"https://registry.alpha.ac/people/william-heiden","jobTitle":"Director","worksFor":{"@type":"Organization","name":"MACROGENICS INC","tickerSymbol":"NASDAQ: MGNX"},"affiliation":[{"@type":"OrganizationRole","roleName":"Director","startDate":"2022-01-01","memberOf":{"@type":"Organization","name":"MACROGENICS INC","url":"https://registry.alpha.ac/companies/macrogenics-inc","tickerSymbol":"NASDAQ: MGNX"}}]},"isBasedOn":[{"@type":"CreativeWork","url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534526000021/mgnx-20260407.htm","name":"MGNX DEF 14A director slate"}],"mainEntityOfPage":"https://registry.alpha.ac/people/william-heiden"},"trust":{"schema_version":"alpha-profile-trust-v1","verification":{"schema_version":"alpha-verification-states-v1","state":"source_reported","identity_ownership":"unclaimed","assurance_level":null,"claim_state_counts":{"source_reported":7,"corroborated":0,"alpha_verified":0,"disputed":0,"superseded":0},"derivation":"claim_states+identity_ownership","summary":"Published claims are reported by public sources; none is Alpha verified. Profile ownership is unclaimed."},"aggregation":{"schema_version":"alpha-claim-aggregation-v1","published_claim_count":7,"under_review_claim_count":0,"owner_supplied_claim_count":0,"evidence_record_count":3,"distinct_source_count":1,"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":"source_reported","identity_ownership":"unclaimed","assurance_level":null,"claim_state_counts":{"source_reported":7,"corroborated":0,"alpha_verified":0,"disputed":0,"superseded":0},"derivation":"claim_states+identity_ownership","summary":"Published claims are reported by public sources; none is Alpha verified. Profile ownership is unclaimed."},"coverage":{"schema_version":"alpha-coverage-metric-v1","published_claims":7,"corroborated_claims":0,"sources":3,"distinct_sources":1,"role_claims":1,"last_reviewed_at":"2026-05-16T01:07:52.169+00:00","observed_at":"2026-09-21T22:34:06.453387+00:00","freshness_days":129}},"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":"william-heiden","canonical_url":"https://registry.alpha.ac/people/william-heiden"},"publication":{"published_at":"2026-09-02T02:37:20.075967+00:00","last_reviewed_at":"2026-05-16T01:07:52.169+00:00","as_of":"2026-09-21T22:34:06.453387+00:00"},"representations":{"html":{"href":"https://registry.alpha.ac/people/william-heiden","media_type":"text/html"},"json":{"href":"https://registry.alpha.ac/api/public/profiles/william-heiden","media_type":"application/json"},"markdown":{"href":"https://registry.alpha.ac/people/william-heiden.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}}}