About Law Firm of Joseph Lassen · San Antonio
The Law Firm of Joseph Lassen is a San Antonio, Texas law practice founded and run by attorney Joseph "Joe" Lassen, a former New York Police Department lieutenant and 9/11 World Trade Center first responder who turned to law after retiring from law enforcement. The firm focuses primarily on family law — divorce, child custody, child support, adoption, and related matters — while also handling DWI/criminal defense, estate planning, bankruptcy, personal injury, and business law. It serves the San Antonio area and surrounding Bexar, Comal, Kendall, and Guadalupe counties, with office hours Monday through Friday from 9 AM to 5 PM.
The Law Firm of Joseph Lassen is led by attorney Joseph Lassen, who began practicing law in 2003 in New York and New Jersey before being admitted to the Texas Bar in 2014 and establishing his San Antonio practice. Before becoming a lawyer, Joe served as a New York City Police Department officer, retiring as a Lieutenant after 20 years, and was a 9/11 first responder at the World Trade Center; while in law school he also worked in the NYPD prosecutor's office on high-profile corruption cases. He earned his B.S. in Legal Studies from John Jay College in 1993 and his Juris Doctorate from Brooklyn Law School in 2002. The firm is built around family law — divorce (uncontested, contested, high-asset, and military), child custody and visitation, child support, alimony, property division, adoption, prenuptial agreements, paternity, restraining orders, and same-sex family law matters, including high-conflict cases and those involving special-needs children or interstate/international custody disputes. Beyond family law, the practice extends to estate planning (wills, trusts, guardianship, health-care directives), bankruptcy (Chapters 7, 11, and 13), DWI/DUI defense, broader criminal defense (drug crimes, assault, sex crimes, theft, gun crimes, expungement), personal injury (car, truck, motorcycle, bicycle, construction accidents, premises liability, wrongful death), business law (formation, contracts, litigation, franchising), and real estate matters. The office is located at 3519 Paesanos Parkway, Suite 100, San Antonio, TX 78231, and serves clients throughout Bexar, Comal, Kendall, and Guadalupe counties. The firm offers free initial consultations, provides Spanish-language assistance, and emphasizes a client-centered, proactive approach that draws on Joe Lassen's combined experience in arrests, prosecution, and defense. Joe is a member of the Texas Bar Association, San Antonio Bar Association, and New York Bar Association; his Texas Bar record (Bar Card No. 24091593) shows no public disciplinary history, most recently certified on 01/09/2025.
- In business
- Practicing law since 2003; Texas Bar admission 2014
- Owner
- Joseph "Joe" Lassen, Esq.
- Serves
- San Antonio and surrounding area — Bexar, Comal, Kendall, and Guadalupe counties, Texas
- Rating
- 4.8/5 (86 reviews on LegalRank)
About The Law Firm of Joseph Lassen
The Law Firm of Joseph Lassen is a San Antonio-based legal practice offering solutions for families and individuals navigating divorce, custody disputes, criminal charges, DWI/DUI, estate planning, personal injury, and business matters. Attorney Joseph Lassen built the firm on the lessons he learned as a New York City Police Department officer and prosecutor — a commitment to effective, expedient resolutions applied to the practice of law. The firm combines trial advocacy with a client-centered, personalized approach, with a stated focus on empowering clients and taking an aggressive stance in court when necessary.
- Former NYPD law enforcement agent and 9/11 World Trade Center first responder
- Former NYPD prosecutor (handled high-profile corruption cases)
- San Antonio practice serving Bexar, Comal, Kendall, and Guadalupe counties
- Free, no-obligation initial consultation offered
- Spanish- and English-language assistance available
Attorney Joseph Lassen
Joseph "Joe" Lassen began practicing law in 2003 in New York and New Jersey and was admitted to the Texas Bar in 2014. He earned his B.S. in Legal Studies from John Jay College in 1993 and his Juris Doctorate from Brooklyn Law School in 2002. Before law school he served as a New York City Police Department officer, retiring as a Lieutenant after 20 years of service, and was a first responder at the World Trade Center on September 11, 2001. While in law school he worked in the NYPD prosecutor's office on high-profile corruption cases. He previously worked for one of the top personal injury attorneys in San Antonio and Corpus Christi and in a high-volume San Antonio family law practice before opening his own firm to provide more personalized service. He is a member of the Texas Bar Association, San Antonio Bar Association, and New York Bar Association, and lives in San Antonio with his wife, Robyn, and their four sons.
- Bar Card No. 24091593 (Texas, licensed 09/11/2014)
- New York Bar (since 2003); New Jersey Bar (since 2003)
- Brooklyn Law School, J.D. (2002)
- John Jay College, B.S. Legal Studies (1993)
- NYPD Lieutenant (retired, 20 years)
- 9/11 WTC first responder
- No public disciplinary history
Practice Areas
The firm maintains a deep family-law focus while offering a broad civil and criminal practice. Lead attorney Joseph Lassen's background in arrests, prosecution, and defense is applied to every case. The firm is particularly noted for handling high-conflict and high-asset family matters, military divorces, complex child custody disputes, and sensitive family transitions.
- Divorce — uncontested, contested, high-asset, military, same-sex
- Child custody and visitation (including special-needs, interstate, and international cases)
- Child support, alimony, property division
- Adoption, paternity, prenuptial agreements, restraining orders
- Estate planning — wills, trusts, guardianship, health-care directives, estate administration
- Bankruptcy — Chapter 7, Chapter 11, Chapter 13, debt relief
- DWI / DUI defense
- Criminal defense — drug crimes, assault, theft, sex crimes, gun crimes, fraud, internet crimes, violent crimes, expungement, criminal appeals
- Personal injury — car, truck, motorcycle, bicycle, construction, premises liability, dog/animal bites, brain injury, wrongful death
- Business law — formation, contracts, dissolution, finance, litigation, franchising, M&A, partnership and shareholder disputes
- Real estate — commercial and residential, easements, eminent domain, HOA, zoning, mortgages, neighbor disputes
Family Law & Divorce
Family law is the cornerstone of the practice. The firm handles uncontested and contested divorces, high-asset and military divorces, child custody and visitation, child support, alimony and spousal support, property division, adoption, paternity, prenuptial and marital agreements, restraining orders, and same-sex family law matters. The firm emphasizes child advocacy: "We focus on child advocacy. We prioritize children and expect our clients to do the same."
- High-conflict custody cases
- Special-needs children custody matters
- Interstate and international custody issues
- Texas 'best interest of the child' standard applied in conservatorship decisions
- Children age 12+ may speak privately with the judge about custody preferences
DWI / DUI Defense
The firm provides dedicated DWI and DUI defense in the San Antonio area. Attorney Lassen advises clients charged with DWI or DUI to seek counsel immediately and applies his prior prosecution and law-enforcement experience to building a strategic defense.
- DWI/DUI charges in San Antonio and surrounding counties
- Strategic defense drawing on prior prosecution experience
Estate Planning
The firm's estate planning practice helps individuals and families protect their legacies through wills, trusts, guardianship, health-care directives, and estate administration, with the goal of fully utilizing the legal benefits of careful planning.
- Wills and trusts
- Guardianship and conservatorship
- Health-care directives
- Estate administration
Criminal Defense
Building on his experience handling high-profile corruption cases in the NYPD prosecutor's office and a career in NYPD law enforcement, Joseph Lassen represents clients facing misdemeanor and felony charges throughout the San Antonio area.
- Drug possession and drug crimes
- Assault and violent crimes
- Theft, fraud, and expungement
- Sex crimes, gun crimes, and internet crimes
- Criminal appeals
Personal Injury
The firm represents injury victims in car, truck, motorcycle, and bicycle accidents, as well as construction accidents, premises liability (slip and fall), animal and dog bites, brain injury, and wrongful death claims.
- Car, truck, motorcycle, bicycle accidents
- Construction accidents
- Premises liability / slip and fall
- Animal and dog bites
- Brain injury and wrongful death
Bankruptcy, Business Law & Real Estate
Beyond family and criminal work, the firm handles Chapter 7, 11, and 13 bankruptcy and debt relief; business law matters including formation, contracts, dissolution, finance, litigation, franchising, M&A, and partnership/shareholder disputes; and a wide range of real estate matters for both commercial and residential clients.
- Chapter 7, 11, and 13 bankruptcy
- Business formation, contracts, dissolution, litigation, franchising
- Mergers & acquisitions; partnership and shareholder disputes
- Commercial and residential real estate; easements, eminent domain, HOA, zoning, mortgages
Client Testimonials
Testimonials published on the firm's website describe cases spanning college-preparation legal help, custody wins, and skillful divorce handling. The firm highlights that clients are kept informed and guided step by step through difficult decisions.
- "I am so grateful for Joseph Lassen's help concerning my son as he prepared to go to college. His knowledge and compassion helped ease this worried mom's mind."
- "You want Joseph Lassen on your team! He went above and beyond, winning my custody case and getting me more rights than I first asked for."
- "Joseph Lassen processed my divorce skillfully. He provided me and my family with the safety and security we needed during a very challenging time."
- "Joseph Lassen is passionate, dedicated, knowledgeable and professional. He will work harder for you than any other attorney."
- "Mr. Lassen's swift and definitive actions helped remedy my situation quickly. His knowledge and willingness to fight for your rights were unsurpassed by any other attorney I spoke with."
Contact & Office
The Law Firm of Joseph Lassen is located at 3519 Paesanos Parkway, Suite 100, San Antonio, TX 78231, in the north San Antonio area. Office hours are Monday through Friday, 9:00 AM to 5:00 PM. New clients can request an appointment through the firm's website or call (210) 625-6540 for a free initial consultation.
- Address: 3519 Paesanos Pkwy, Ste 100, San Antonio, TX 78231
- Phone: (210) 625-6540
- Hours: Mon–Fri 9 AM–5 PM; Sat–Sun Closed
- Free, no-obligation initial consultation
- Spanish- and English-language assistance