Atty. Mark Janssen
Mr. Mark Janssen is a lawyer practicing criminal trial law, family law, civil litigation and 1 other area of law.
Civil Litigation & More Attorney · Serving San Marcos, TX · 44+ Years Experience
Profile Summary
About Mark Janssen at a Glance
Mark Janssen is a criminal defense, family law, and litigation attorney based in San Marcos, Texas. They have 44+ years of legal experience, licensed to practice since 1982. Admitted to practice in Texas (1982) and Colorado (1990). Educated at Texas Tech University (J.D., 1982) and Texas A. & M. University (B.A., 1979). Recognitions include CV Notable. Serves clients in San Marcos, TX and the surrounding metropolitan area.
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About Mark Janssen
- Mr. Mark Janssen is a lawyer practicing criminal trial law, family law, civil litigation and 1 other area of law
- Mark received a B.A. degree from Texas A. & M. University in 1979, and has been licensed for 44 years
- Mark practices in San Marcos, TX
Practice Areas Explained
Mark Janssen's Areas of Legal Practice
Each practice area below reflects the types of cases Mark Janssen handles, with a practical overview of what that area of law involves and how it may apply to your situation in San Marcos.
Criminal Defense in San Marcos
A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.
Mark Janssen is one of 212,605 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Texas →
Family Law in San Marcos
Family law attorneys handle divorce, child custody, child support, adoption, prenups, and protective orders. Find verified family lawyers near you.
Mark Janssen is one of 185,688 family law attorneys indexed nationally. Browse family law attorneys in Texas →
Civil Litigation in San Marcos
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Mark Janssen is one of 450,751 litigation attorneys indexed nationally. Browse litigation attorneys in Texas →
Jurisdictional Context
Why Local Counsel Matters in San Marcos
Practicing law in Texas. Legal matters in Texas are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in San Marcos are typically filed in the local municipal court or the appropriate Texas state district court, depending on subject matter and amount in controversy. An attorney licensed in Texas brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Texas courts without local counsel or pro hac vice admission.
San Marcos Courts and Legal Process
Choosing a San Marcos-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional Texas attorneys? Browse all attorneys in San Marcos or all attorneys in Texas.
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Professional Profile
Why Clients in San Marcos Choose Mark Janssen
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Mark Janssen's practice in the field of criminal defense, family law, and litigation.
Decade-Tested Legal Experience
Mark Janssen brings 44+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Multi-State Bar Admission
Licensed in Texas and Colorado, Mark Janssen can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering criminal defense, family law, and litigation, Mark Janssen can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in San Marcos
A San Marcos-based practice means Mark Janssen attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues Mark Janssen Handles in San Marcos
Below is a representative sample of the types of matters Mark Janssen has experience with under Texas law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact Mark Janssen directly to discuss the specifics of your situation.
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How People Find Mark Janssen Online
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Mark Janssen's Practice Areas & Specializations
Education & Law School Background
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