---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-085407"
form_type: "8-K"
ticker: "TTEK"
cik: "0000831641"
company_name: "TETRA TECH INC"
filed_at: "2024-08-02T23:59:59+00:00"
generated_at: "2026-05-31T13:33:40.353048+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Tetra Tech appoints John M. Douglas to board; Joanne Maguire retiring Sep 30

## Summary
- John M. Douglas appointed to Tetra Tech's Board effective September 30, 2024; will serve on Compensation and Nominating & Governance Committees.
- Douglas most recently was CEO of RPS Group (2017-2023), a UK-listed consultancy in energy, water, and program management.
- Joanne M. Maguire will retire from the Board on September 30, 2024; she did not cite any disagreement with company operations.
- Board will consist of seven members after the changes.
- Douglas holds an MBA from London Business School and a B.S. in Civil Engineering from Adelaide University.

## SEC filing metadata
- accession: 0001104659-24-085407
- form_type: 8-K
- ticker: TTEK
- cik: 0000831641
- company_name: TETRA TECH INC
- filed_at: 2024-08-02T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/831641/000110465924085407/0001104659-24-085407-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/831641/000110465924085407/tm2420667d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-085407
- JSON: https://secwatch.observer/filing/0001104659-24-085407.json
- Plain text: https://secwatch.observer/filing/0001104659-24-085407.txt

## Key facts
- Executive change
  Joanne M. Maguire departed as Director at TETRA TECH INC.
  - Action: retire
  - Role: Director
  source text: Joanne M. Maguire notified the Company on July 29, 2024 of her decision to retire as a member of the Board, effective September 30, 2024
  evidence_url: https://www.sec.gov/Archives/edgar/data/831641/000110465924085407/0001104659-24-085407-index.htm
- Executive change
  John M. Douglas was appointed as Director at TETRA TECH INC.
  - Action: appointed
  - Role: Director
  source text: John M. Douglas has been appointed to the Board of Directors of the Company (the “Board”), effective September 30, 2024
  evidence_url: https://www.sec.gov/Archives/edgar/data/831641/000110465924085407/0001104659-24-085407-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.