GM
Guillermo Matthew Martinez
Guillermo Matthew Martinez is a lawyer in Omaha, NE who works for Guinan O'Siochain Law Group, LLC. Practice areas include Appellate: Civil, Business, Construction. Licensed in Texas since 2024. Graduated from Creighton University in 2023.
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Law school
Bar admission
Office
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Guillermo Matthew Martinez
Guinan O'Siochain Law Group, LLCOmaha, NE·1 years licensed
Claim profileContact attorney
Guillermo Matthew Martinez is a lawyer in Omaha, NE who works for Guinan O'Siochain Law Group, LLC. Practice areas include Appellate: Civil, Business, Construction. Licensed in Texas since 2024. Graduated from Creighton University in 2023.
Law school
Creighton University
Class of 2023
Bar admission
2024
State Bar of TX · No. 24144867
Office
1010 N 102nd St Ste 203
Omaha, NE 68114
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.
- Sherrets Bruno & Vogt LLCAS OF APR 2026Private Law Practice · Omaha, NE
- Guinan O'Siochain Law Group, LLCAS OF JUN 2026Private Law Practice · Omaha, NE
Case data
Case data
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Practice & jurisdiction
Practice areas
- Appellate: Civil
- Business
- Construction
- Contracts
- Litigation: Commercial
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Last refreshed Jun 2026