
Matthew Clausen Mousley, IP Attorney in Philadelphia, Pennsylvania
Over 22 years of legal practice
PartneratDuane Morris LLP
Philadelphia, PA
Practicing ip in Philadelphia since 2004.
- 22+
- Years practicing
- 2
- Bar admissions
Practices in
Are you Matthew Clausen Mousley?
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Quick answer
Matthew Clausen Mousley is a partner based in Philadelphia, PA. The practice focuses on IP. Matthew has over 22 years of legal experience. Currently practicing at Duane Morris LLP.
- Based in
- Philadelphia, PA
- Experience
- over 22 years
- Known for
- IP
- Handles IP matters from Philadelphia, PA.
- Over 22 years of practice as a licensed attorney.
About Matthew Clausen Mousley: Matthew Clausen Mousley is a partner based in Philadelphia, PA. The practice focuses on IP. Matthew has over 22 years of legal experience. Currently practicing at Duane Morris LLP.
Areas of practice
Practice areas handled by Matthew Clausen Mousley
Matthew concentrates on ip. Each area below outlines the kind of case Matthew handles, typical outcomes to expect, and how the intake process starts.
IP cases in Philadelphia, Pennsylvania
Matthew takes ip matters in Philadelphia, Pennsylvania. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Matthew agrees to represent you.
Biography
About Matthew Clausen Mousley — Over 22 years of Pennsylvania ip experience
Matthew Clausen Mousley is a partner based in Philadelphia, PA. The practice focuses on IP. Matthew has over 22 years of legal experience. Currently practicing at Duane Morris LLP.
Matthew Clausen Mousley is a lawyer practicing intellectual property, intellectual property litigation. Matthew received a B.A. degree from Franklin & Marshall College in 2001, and has been licensed for 22 years. Matthew practices at Duane Morris LLP in Philadelphia, PA.
Working with Matthew on a ip matter
Matthew Clausen Mousley is a lawyer practicing intellectual property, intellectual property litigation. Matthew received a B.A. degree from Franklin & Marshall College in 2001, and has been licensed for 22 years. Matthew practices at Duane Morris LLP in Philadelphia, PA.
Who Matthew represents
Matthew reviews new inquiries case-by-case for ip matters in Philadelphia and the surrounding Pennsylvania area.
Credentials
Matthew Clausen Mousley's legal education and bar admissions
Villanova University School of Law
J.D. · 2004
Franklin & Marshall College
B.A. · 2001
Jurisdictions
Matthew's state bar admissions
Pennsylvania
2004 · ACTIVE
New Jersey
2004 · ACTIVE
Matthew studied at J.D. in Villanova University School of Law and B.A. in Franklin & Marshall College.
Law school and academic background
Matthew completed J.D. in Villanova University School of Law and B.A. in Franklin & Marshall College. Formal legal training is one signal of substantive knowledge — the day-to-day practice Matthew runs in Pennsylvania is where that training gets applied to real client questions.
Affiliations
Matthew's professional memberships and bar associations
Professional Activities •International Technology Law Association - ITechLaw (formerly Computer Law Association) - Board of Directors, 2011-present - Vice-chair of Membership committee, 2012-present - Editor of E-Newsletter, 2010-2012 - U
membership
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membership
Locations
Matthew Clausen Mousley's office in Philadelphia
Matthew's primary office is at 30 South 17th Street, Philadelphia, PA, 19103. In-person meetings are by appointment; a phone intake usually comes first.
Client feedback
Client reviews of Matthew Clausen Mousley
Matthew has not yet collected verified client reviews on LawyersListed. Reviews here are all from confirmed clients; anonymous ratings are moderated out.
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Schedule your consultationHiring guide
How to hire Matthew Clausen Mousley — what to expect in your first consultation
Working with a new ip attorney should feel structured. Here's how the first two conversations with Matthew usually go, from the moment you request a consult to the day representation begins.
Consultation formats and pricing
Matthew charges for the initial consult. That fee is credited toward representation if you retain Matthew's office.
What to bring to your first meeting
Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; Matthew will tell you what matters and what doesn't.
Questions to ask a ip attorney in Philadelphia, Pennsylvania
A short list to run through before you commit: How many ip matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?
Fees & payment
Fees, payment methods, and consultation options for Matthew
Matthew discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in ip practice — ask which fits.
Hourly rates, contingency fees, and flat-fee options
Every ip matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. Matthew confirms the model in the engagement letter before any work starts.
Payment methods and payment plans
Matthew's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many ip practices work with clients on structured schedules.
Frequently asked
Frequently asked questions about Matthew Clausen Mousley
How much does it cost to hire Matthew for a ip case?
Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Matthew walks through the likely range during the consult so there are no surprises.
Does Matthew offer a free consultation?
Matthew charges for the initial consult; that fee is credited toward representation if you retain Matthew's office. Some ip attorneys offer free consults — check Matthew's current terms during booking.
How long do ip cases in Pennsylvania typically take?
Simple ip matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. Matthew gives a realistic estimate for your facts at the consult — vague answers here are a red flag.
Can Matthew take my case if I'm outside Philadelphia?
Matthew is licensed in Pennsylvania. Matters governed by Pennsylvania law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Matthew will tell you if the case is a fit or refer you to someone closer to your court.
What should I bring to my first meeting with Matthew?
Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. Matthew will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.
Is Matthew accepting new ip clients right now?
Matthew's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.
Areas served
IP attorneys serving Philadelphia, Pittsburgh and Harrisburg in Pennsylvania
Matthew handles ip matters throughout Pennsylvania. Each city below is a direct link into the search page for verified ip attorneys in that community.
More counsel
Other top-rated ip attorneys in Pennsylvania
If Matthew's intake is full or the fit isn't right, these ip attorneys in Philadelphia handle similar matters. Every profile below is verified and open to consultations.

Gary Green
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Casey B. Green
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Nancy L. Lanard
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Shawn McBrearty
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Alexis Dillett Isztwan
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5.0· 9