AttorneyJack Trigg Gannon● 14 total views
JG

Jack Trigg Gannon

Sims Moore Hill & Gannon, LLP·Hillsboro, TX·42 years licensed

Jack Trigg Gannon is a lawyer in Hillsboro, TX who works for Sims Moore Hill & Gannon, LLP. Practice areas include Business, Finance, Oil, Gas and Energy Resources. Court admissions include Texas Northern District Court, US Tax Court. Licensed in Texas since 1983. Graduated from Southern Methodist University in 1983.

Claim profileContact attorney
Law school
Class of 1983
Bar admission
1983
State Bar of TX · No. 7623500
Office
PO Box 1096
Hillsboro, TX 76645
Disciplinary
None on record
Clean since admission
JG
Hillsboro, TX·42 years licensed
Claim profileContact attorney

Jack Trigg Gannon is a lawyer in Hillsboro, TX who works for Sims Moore Hill & Gannon, LLP. Practice areas include Business, Finance, Oil, Gas and Energy Resources. Court admissions include Texas Northern District Court, US Tax Court. Licensed in Texas since 1983. Graduated from Southern Methodist University in 1983.

Law school
Bar admission
1983
State Bar of TX · No. 7623500
Office
PO Box 1096
Hillsboro, TX 76645
Disciplinary
None on record
Clean since admission
Career history

2 observed firms

Based on State Bar of Texas snapshots — each row is a firm the attorney was registered with at one of our quarterly pulls.

  1. Unknown firmMAY 2023 — APR 2026
    Private Law Practice · Hillsboro, TX
  2. Sims Moore Hill & Gannon, LLPAS OF JUN 2026
    Private Law Practice · Hillsboro, TX
Case data

Case data

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Practice & jurisdiction
Practice areas
  • Business
  • Finance
  • Oil, Gas and Energy Resources
  • Real Estate
  • Wills-Trusts-Probate
Courts admitted
  • Texas Northern District Court
  • US Tax Court
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Last refreshed Jun 2026