Atty. Sean Lanphier
Atty. Sean Lanphier is a lawyer practicing litigation, nasd arbitration, appellate practice.
Appellate Practice & More Attorney · Serving Milwaukee, WI · 41+ Years Experience
Profile Summary
About Sean Lanphier at a Glance
Sean Lanphier is a Shareholder based in Milwaukee, Wisconsin. They have 41+ years of legal experience, licensed to practice since 1985. Their practice focuses on litigation, adr, and appellate. Admitted to practice in New York (1985), Wisconsin (1986), U.S. District Court, Eastern District of Wisconsin (1986), and U.S. District Court, Western District of Wisconsin (1986). Educated at Washington University (J.D., 1984) and University of Wisconsin-Milwaukee (B.A. New, 1976). Recognitions include AV Preeminent. Serves clients in Milwaukee, WI and the surrounding metropolitan area.
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About Sean Lanphier
- Atty. Sean Lanphier is a lawyer practicing litigation, nasd arbitration, appellate practice
- Sean received a B.A. degree from University of Wisconsin-Milwaukee in 1976, and has been licensed for 41 years
- Sean practices in Milwaukee, WI
Practice Areas Explained
Sean Lanphier's Areas of Legal Practice
Each practice area below reflects the types of cases Sean Lanphier handles, with a practical overview of what that area of law involves and how it may apply to your situation in Milwaukee.
Civil Litigation in Milwaukee
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Sean Lanphier is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in Wisconsin →
Mediation & Arbitration in Milwaukee
Mediators and arbitrators for civil, commercial, family, and employment dispute resolution.
Sean Lanphier is one of 73,315 adr attorneys indexed nationally. Browse adr attorneys in Wisconsin →
Appellate Practice in Milwaukee
Appellate attorneys for civil and criminal appeals at state and federal court.
Sean Lanphier is one of 85,572 appellate attorneys indexed nationally. Browse appellate attorneys in Wisconsin →
Jurisdictional Context
Why Local Counsel Matters in Milwaukee
Practicing law in Wisconsin. Legal matters in Wisconsin are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Milwaukee are typically filed in the local municipal court or the appropriate Wisconsin state district court, depending on subject matter and amount in controversy. An attorney licensed in Wisconsin 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 Wisconsin courts without local counsel or pro hac vice admission.
Milwaukee Courts and Legal Process
Choosing a Milwaukee-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 Wisconsin attorneys? Browse all attorneys in Milwaukee or all attorneys in Wisconsin.
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Professional Profile
Why Clients in Milwaukee Choose Sean Lanphier
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 Sean Lanphier's practice in the field of litigation, adr, and appellate.
Decade-Tested Legal Experience
Sean Lanphier brings 41+ 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 New York, Wisconsin, and U.S. District Court, Eastern District of Wisconsin, Sean Lanphier can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering litigation, adr, and appellate, Sean Lanphier can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Milwaukee
A Milwaukee-based practice means Sean Lanphier attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
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How People Find Sean Lanphier Online
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Sean Lanphier's Practice Areas & Specializations
Education & Law School Background
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Bar Admissions & Licensed Jurisdictions
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