Atty. Dennis Jansen

Atty. Dennis Jansen

Dennis Jansen is a lawyer practicing state and local tax, tax, tax controversy & litigation and 6 other areas of law. Dennis received a B.A. degree from University of Miami, and has been licensed for 9 years.

Washington Washington 9 yrs experience 9 year
Call (443) 909-4915 Book Appointment

Profile Summary

About Dennis Jansen at a glance

Dennis Jansen is an Associate based in Washington, District of Columbia, practicing at Eversheds Sutherland Us Llp. They have 9+ years of legal experience, licensed to practice since 2017. Their practice focuses on irs, tax, cannabis, and energy. Admitted to practice in Texas (2017) and District of Columbia (2019). Educated at Georgetown University Law Center (LL.M. Taxation, 2018) and University of Miami B.A. (—). Active member of L. Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Dennis Jansen is a lawyer practicing state and local tax, tax, tax controversy & litigation and 6 other areas of law
  • Dennis received a B.A. degree from University of Miami, and has been licensed for 9 years
  • Dennis practices at Eversheds Sutherland (US) LLP in Washington, DC

Practice Areas Explained

Dennis Jansen's Areas of Practice

Each practice area below reflects the types of cases Dennis Jansen handles, with a brief overview of what that area of law covers.

IRS Disputes & Audits

Dennis Jansen is one of 2,917 irs attorneys indexed nationally. Browse irs attorneys in District of Columbia →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Dennis Jansen is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in District of Columbia →

Cannabis & Marijuana Law

Cannabis attorneys for business licensing, regulatory compliance, and marijuana-related legal matters.

Dennis Jansen is one of 3,138 cannabis attorneys indexed nationally. Browse cannabis attorneys in District of Columbia →

Energy & Utilities Law

Energy attorneys for oil & gas, renewables, utility regulation, and energy sector transactions.

Dennis Jansen is one of 36,230 energy attorneys indexed nationally. Browse energy attorneys in District of Columbia →

Jurisdictional Context

Why local counsel matters in District of Columbia

Practicing law in District of Columbia. Legal matters in District of Columbia are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Washington are typically filed in the local municipal court or the appropriate District of Columbia state district court, depending on subject matter and amount in controversy. An attorney licensed in District of Columbia brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in District of Columbia courts without local counsel or pro hac vice admission.

Looking for additional District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.

Frequently Asked

Common questions about Dennis Jansen

Where is Dennis Jansen's law office located?
Dennis Jansen's law practice is located in Washington, District of Columbia. The firm is Eversheds Sutherland Us Llp. You can contact the office directly through this profile page.
What practice areas does Dennis Jansen handle?
Dennis Jansen focuses on irs, tax, cannabis, energy. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Dennis Jansen practiced law?
Dennis Jansen has 9+ years of legal experience and has been licensed since 2017.
Where did Dennis Jansen go to law school?
Dennis Jansen earned their education at (LL.M. Taxation, 2018); (—).
How can I contact Dennis Jansen for a consultation?
You can contact Dennis Jansen directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

LL.M. Taxation
Georgetown University Law Center
- 2018
University of Miami B.A.
- In Progress

Bar Admissions

Texas
Admitted: 2017
District of Columbia
Admitted: 2019

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