Diez and Osuna - San Antonio, TX
Diez and Osuna is an acclaimed immigration and nationality law firm based in San Antonio, Texas, founded in 1998. Co-founded by Board Certified immigration attorney Jaime M. Diez and litigator Tomas P. Osuna, the firm is nationally recognized for high-stakes deportation defense, border midwife passport challenges, and free walk-in consultation accessibility for South Texas communities.
Nationally Recognized Immigration and Nationality Counsel in San Antonio
Founded in 1998, Diez and Osuna has built an extraordinary record defending immigrants and citizens throughout Texas and the borderlands. Based in the historic Westside on Buena Vista Street in San Antonio, the firm brings together decades of deep legal proficiency and fearless trial advocacy. From routine family green cards to emergency injunctions blocking federal removal actions, the firm is widely sought after when clients need to find an attorney who will tenaciously contest complex legal charges.
Defending Citizenship in Midwife and Passport Revocation Cases
One of the most distinguished areas of practice at Diez and Osuna is their groundbreaking work defending U.S. citizens born along the Texas-Mexico border whose citizenship has been unjustly challenged. For decades, the Department of State has subjected individuals delivered by South Texas midwives to unfair suspicion, denying or revoking valid American passports. Serving as dedicated citizenship lawyers, partner Jaime M. Diez has repeatedly taken these cases to federal court to vindicate clients' birthrights. Key services in this niche include:
- Filing federal court lawsuits under 8 U.S.C. 1503 to obtain declaratory judgments of U.S. citizenship.
- Challenging arbitrary passport denials, revocations, and border detentions by federal agents.
- Gathering historical baptismal records, prenatal documents, and school records to prove birth on American soil.
- Representing citizens wrongfully placed in deportation proceedings due to questioned birth certificates.
- Establishing citizenship through acquisition and derivation for foreign-born children of American citizens.
Vigorous Deportation Defense and Federal Immigration Litigation
When individuals are threatened with expulsion, the firm acts as formidable deportation defense lawyers. Partner Jaime M. Diez has repeatedly made national headlines, including appearances on MSNBC and major news broadcasts, for taking on complex executive orders, detention policies, and federal statutes. The firm represents detained immigrants facing removal before immigration judges across Texas, securing bonds, asserting defenses against criminal inadmissibility, and appealing adverse decisions to the Board of Immigration Appeals and the federal appellate courts.
Family Petitions and Permanent Residency Processing
In addition to complex litigation, the firm serves as attentive family immigration lawyers, guiding relatives toward lawful permanent residency. The team handles family-sponsored immigrant visa petitions, consular processing, adjustment of status, and provisional unlawful presence waivers. Every filing is handled with meticulous precision, preventing administrative rejections and reducing wait times for reuniting loved ones.
Board-Certified Leadership with High-Impact Experience
Co-founding partner Jaime M. Diez holds a Master of Laws from Georgetown University and earned Board Certification in Immigration and Nationality Law from the Texas Board of Legal Specialization. Together with partner Tomas P. Osuna, an SMU Dedman School of Law graduate admitted across state and federal courts, the firm provides multilingual counsel in English, Spanish, and French. Clients who hire an attorney from Diez and Osuna benefit from legal counsel tested against government prosecutors in high-stakes litigation.
Open Accessibility Through Walk-In Consultations on Buena Vista Street
Diez and Osuna believes that access to trustworthy legal representation should never be hindered by bureaucratic obstacles. The firm maintains an open walk-in consultation policy at its Buena Vista Street office, welcoming individuals and families without requiring advance appointments. When you need urgent legal counsel regarding a passport denial, deportation order, or green card petition, Diez and Osuna offers dependable representation backed by over three decades of legal leadership.
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Location & Access
Primary Address
Located in the historic Prospect Hill neighborhood within the rapidly developing Buena Vista corridor on the West Side of San Antonio.
Building Location
The office is located in the Buena Vista Business Center, a one-story Class C commercial office building built in 1970 and featuring newly renovated office studios. It is located near the Prospect Hill Missionary Baptist Church.
Parking Details
For clients and visitors, there is a secure, fenced-in on-site surface parking lot with 15 to 20 spaces located behind the building.
Public Transit
Served by VIA Metropolitan Transit Route 75 (West Commerce); nearest stop is at Buena Vista & Trinity.
Accessibility / Suite Access
Enter the Buena Vista Business Center through the main front entrance facing Buena Vista St. The office is located on the ground floor, directly accessible from the central hallway.