# Mark A. Alexander

> Alpha governed public record. Unknown, unavailable, and unpublished values are never inferred as zero.

## Record

| Field | Value |
| --- | --- |
| Representation | alpha-profile-markdown-v4 |
| Protocol | Alpha Governance Facts Protocol 0.1 |
| Schema | alpha.governance.entity.public.v1 |
| Record version | public-0:d751713988987e9331980363e24189ce |
| Governance record representation | alpha-governance-record-v2 |
| Canonical entity | alpha:person:mark-a-alexander |
| Entity type | Person |
| Canonical URL | https://registry.alpha.ac/people/mark-a-alexander |
| Publication | PUBLISHED |
| Verification | corroborated |
| Verification schema | alpha-verification-states-v1 |
| Ownership | unclaimed |
| Published claims | 14 |
| Claims under review | 0 |
| Evidence records | 6 |
| Conflicts | 0 |
| Conflicts in internal review | 0 |
| Observed | 2026-10-16T07:22:33.016619+00:00 |
| Last reviewed | 2026-05-18T18:50:47.382+00:00 |

## Identity

- Legal name: Mark A. Alexander
- Display name: Mark A. Alexander

## Alpha Governance Record

| Field | Value |
| --- | --- |
| Governance Record schema | alpha-governance-record-v2 |
| Ontology | alpha-governance-ontology-v1 |
| Record version | public-0:d751713988987e9331980363e24189ce |
| As of | 2026-10-16T07:22:33.35387+00:00 |
| Completeness | 1 |
| Record Quality | 0.942 |
| Directors | 0 |
| Committees | 0 |
| Governance events | 1 |
| Entity class | person |

## Section coverage

| Section | State |
| --- | --- |
| identity | PUBLISHED |
| corporate_structure | NOT_APPLICABLE |
| board | NOT_APPLICABLE |
| committees | NOT_APPLICABLE |
| leadership | NOT_APPLICABLE |
| ownership | NOT_APPLICABLE |
| financials | NOT_APPLICABLE |
| capital_structure | NOT_APPLICABLE |
| compensation | NOT_APPLICABLE |
| governance | NOT_APPLICABLE |
| shareholder_governance | NOT_APPLICABLE |
| audit | NOT_APPLICABLE |
| legal | NOT_APPLICABLE |
| risk | NOT_APPLICABLE |
| cyber | PUBLISHED |
| ai_governance | PUBLISHED |
| agent_governance | NOT_APPLICABLE |
| markets_external | NOT_APPLICABLE |
| events | PUBLISHED |
| relationships | PUBLISHED |
| assessments | PUBLISHED |
| evidence | PUBLISHED |

## Governance events

- DIRECTOR_APPOINTED: Mark A. Alexander seat on Builders FirstSource, effective 2021-01-01. Effective: 2021-01-01. Detected: 2026-05-18T18:50:47.382+00:00. event_id=alpha:event:transition:8vc7xqk1gdbw

## Scoped resources

- `alpha://person/mark-a-alexander` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record
- `alpha://person/mark-a-alexander/identity` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=identity
- `alpha://person/mark-a-alexander/corporate-structure` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=corporate-structure
- `alpha://person/mark-a-alexander/board` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=board
- `alpha://person/mark-a-alexander/committees` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=committees
- `alpha://person/mark-a-alexander/leadership` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=leadership
- `alpha://person/mark-a-alexander/ownership` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=ownership
- `alpha://person/mark-a-alexander/financials` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=financials
- `alpha://person/mark-a-alexander/capital-structure` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=capital-structure
- `alpha://person/mark-a-alexander/compensation` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=compensation
- `alpha://person/mark-a-alexander/governance` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=governance
- `alpha://person/mark-a-alexander/shareholder-governance` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=shareholder-governance
- `alpha://person/mark-a-alexander/audit` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=audit
- `alpha://person/mark-a-alexander/legal` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=legal
- `alpha://person/mark-a-alexander/risk` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=risk
- `alpha://person/mark-a-alexander/cyber` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=cyber
- `alpha://person/mark-a-alexander/ai-governance` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=ai-governance
- `alpha://person/mark-a-alexander/agents` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=agents
- `alpha://person/mark-a-alexander/ecosystem` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=ecosystem
- `alpha://person/mark-a-alexander/events` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=events
- `alpha://person/mark-a-alexander/relationships` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=relationships
- `alpha://person/mark-a-alexander/assessments` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=assessments
- `alpha://person/mark-a-alexander/evidence` (contract): https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record&section=evidence

## Role modules

- Director

## Attention

- NO_RECORDS_FOUND

## Committee data

- NO_RECORDS_FOUND

## Leadership

- PUBLISHED

## Roles

- Director at Builders FirstSource. Claim: alpha:claim:person:mark-a-alexander:role:1. Valid from: 2021-01-01. Valid to: NOT_ASSERTED. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:186c8cf765dd94c14f3691cac1661fd93f6514d471fbabb066d4638d9b0e8c71.

## Governance

- PUBLISHED

## Board committees

- PUBLISHED

## AI and ML experience

- AI and ML experience: not identified in the cited filing. Claim: alpha:claim:person:mark-a-alexander:ai_ml_experience:1. Publication: PUBLISHED. Verification: corroborated. Assertion: source_reported. Evidence: alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933, alpha:projection-evidence:document:2140d0ec5e325b69fb01d8c5a8c326cd2907ee950ca44aa0d468743e0c3ea98b.

## Board independence

- Independent director. Claim: alpha:claim:person:mark-a-alexander:board_independence:2. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:51b2c33feb4a230b8f008853035e7c43815b4b2129778eb4a2bc10a8953f7f6c.

## Board membership

- Serves on the board of Builders FirstSource, Inc.. Claim: alpha:claim:person:mark-a-alexander:board_membership:3. Publication: PUBLISHED. Verification: corroborated. Assertion: source_reported. Evidence: alpha:projection-evidence:document:51b2c33feb4a230b8f008853035e7c43815b4b2129778eb4a2bc10a8953f7f6c, alpha:projection-evidence:8713277aaceddeccec5ef5fc67806644fd659ba8d9a3514978eb1cde8fb0511a.

## Board role

- Board role: Director. Claim: alpha:claim:person:mark-a-alexander:board_role:4. Valid from: 2026-04-02. Valid to: NOT_ASSERTED. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933.

## Committee assignments

- Committee assignments: Audit Committee. Claim: alpha:claim:person:mark-a-alexander:committee_assignments:5. Valid from: 2026-04-02. Valid to: NOT_ASSERTED. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933.

## Cybersecurity experience

- Cybersecurity experience: not identified in the cited filing. Claim: alpha:claim:person:mark-a-alexander:cybersecurity_experience:6. Publication: PUBLISHED. Verification: corroborated. Assertion: source_reported. Evidence: alpha:projection-evidence:document:2140d0ec5e325b69fb01d8c5a8c326cd2907ee950ca44aa0d468743e0c3ea98b, alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933.

## Executive company

- Executive at FLUOR CORP. Claim: alpha:claim:person:mark-a-alexander:executive_company:7. Valid from: 2026-02-17. Valid to: NOT_ASSERTED. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:2140d0ec5e325b69fb01d8c5a8c326cd2907ee950ca44aa0d468743e0c3ea98b.
- Executive at Ladder Capital Corp. Claim: alpha:claim:person:mark-a-alexander:executive_company:8. Valid from: 2026-04-21. Valid to: NOT_ASSERTED. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:45bf36ac6aded09c4ca8871e31113d9303cd8f11ee428cfaa0d34a8b1cbfa641.
- Executive at Landmark Property Group. Claim: alpha:claim:person:mark-a-alexander:executive_company:9. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933.

## Executive title

- Executive title: Director. Claim: alpha:claim:person:mark-a-alexander:executive_title:10. Valid from: 2026-04-21. Valid to: NOT_ASSERTED. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:45bf36ac6aded09c4ca8871e31113d9303cd8f11ee428cfaa0d34a8b1cbfa641.
- Executive title: Founder, Chairman and Chief Executive Officer. Claim: alpha:claim:person:mark-a-alexander:executive_title:11. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933.
- Executive title: Group President, Project Execution. Claim: alpha:claim:person:mark-a-alexander:executive_title:12. Valid from: 2026-02-17. Valid to: NOT_ASSERTED. Publication: PUBLISHED. Verification: source_reported. Assertion: source_reported. Evidence: alpha:projection-evidence:document:2140d0ec5e325b69fb01d8c5a8c326cd2907ee950ca44aa0d468743e0c3ea98b.

## Technology background

- Technology background: not identified in the cited filing. Claim: alpha:claim:person:mark-a-alexander:technology_background:13. Publication: PUBLISHED. Verification: corroborated. Assertion: source_reported. Evidence: alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933, alpha:projection-evidence:document:2140d0ec5e325b69fb01d8c5a8c326cd2907ee950ca44aa0d468743e0c3ea98b.

## Coverage states

| Field | Value |
| --- | --- |
| Identity | PUBLISHED |
| Business | NOT_APPLICABLE |
| Leadership | PUBLISHED |
| Board and committees | PUBLISHED |
| Governance | PUBLISHED |
| Financials | NOT_APPLICABLE |
| Workforce | NOT_APPLICABLE |
| Ownership | NOT_APPLICABLE |
| Ratings | NOT_PUBLISHED |
| Market and index context | NOT_APPLICABLE |

## Public sources

- alpha:projection-evidence:document:45bf36ac6aded09c4ca8871e31113d9303cd8f11ee428cfaa0d34a8b1cbfa641: [LADR DEF 14A executive officers](https://www.sec.gov/Archives/edgar/data/1577670/000157767026000018/ladr-20260421.htm).
- alpha:projection-evidence:document:4948abf3d0614cdcc4a1a8a723fc61e496ebff58ae13da14c1054f1bd698c933: [BLDR DEF 14A director slate](https://www.sec.gov/Archives/edgar/data/1316835/000119312526140509/bldr-20260402.htm).
- alpha:projection-evidence:document:186c8cf765dd94c14f3691cac1661fd93f6514d471fbabb066d4638d9b0e8c71: [sec_proxy](https://www.sec.gov/Archives/edgar/data/1316835/000119312526140509/bldr-20260402.htm).
- alpha:projection-evidence:document:2140d0ec5e325b69fb01d8c5a8c326cd2907ee950ca44aa0d468743e0c3ea98b: [FLR 10-K executive officers](https://www.sec.gov/Archives/edgar/data/1124198/000112419826000007/flr-20251231.htm).
- alpha:projection-evidence:document:51b2c33feb4a230b8f008853035e7c43815b4b2129778eb4a2bc10a8953f7f6c: [Builders FirstSource, Inc. director board source](https://www.sec.gov/Archives/edgar/data/1316835/000095017025054235/bldr-20250414.htm).
- alpha:projection-evidence:8713277aaceddeccec5ef5fc67806644fd659ba8d9a3514978eb1cde8fb0511a: [public_source](https://www.sec.gov/Archives/edgar/data/1316835/000119312526140509/bldr-20260402.htm).

## Rights

| Field | Value |
| --- | --- |
| 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 |

## 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.

## Alternate representations

- [Canonical profile](https://registry.alpha.ac/people/mark-a-alexander)
- [Public Markdown](https://registry.alpha.ac/people/mark-a-alexander.md)
- [Public JSON](https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=record)
- [JSON-LD](https://registry.alpha.ac/api/public/profiles/mark-a-alexander?format=jsonld)
- MCP resource: `alpha://people/mark-a-alexander` at https://mcp.alpha.ac/mcp


## Connected governance records

Only explicitly published, rights-cleared records. Missing records do not establish absence, safety, or complete coverage.