---
title: "PRESTON JOHN T — Ownership Dossier"
canonical: https://whiteintel.dev/entity/af85f439-daf2-52a1-be35-e2bcf6bb1bbc
json: https://whiteintel.dev/api/public/dossier/af85f439-daf2-52a1-be35-e2bcf6bb1bbc
identifier: sec:0000938731
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# PRESTON JOHN T

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0000938731`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/af85f439-daf2-52a1-be35-e2bcf6bb1bbc  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/af85f439-daf2-52a1-be35-e2bcf6bb1bbc  

## Ownership & control

### Holdings / subsidiaries

- **CLEAN HARBORS INC** (director) — https://whiteintel.dev/entity/4f026b65-b966-51be-a30d-a5f099524f54
- **ALSERES PHARMACEUTICALS INC /DE** (director) — https://whiteintel.dev/entity/afbe6367-df2f-58b9-8f26-8cbd10f79fdc
- **E-Z-EM, INC.** (director) — https://whiteintel.dev/entity/ae67c394-d540-5ffe-892b-57a5915c3b55

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **PRESTON JOHN T**. Human view: https://whiteintel.dev/entity/af85f439-daf2-52a1-be35-e2bcf6bb1bbc · Structured JSON: https://whiteintel.dev/api/public/dossier/af85f439-daf2-52a1-be35-e2bcf6bb1bbc._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._