
Dennis Joseph Callahan, Contracts Attorney in San Francisco, California
Over 22 years of legal practice · focused on Contracts, Government, and Litigation
AssociateatRogers Joseph O Donnell A Professional Corporation
San Francisco, CA
Practicing contracts in San Francisco since 2004.
- 22+
- Years practicing
- 3
- Bar admissions
Practices in
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Quick answer
Dennis Joseph Callahan is an associate based in San Francisco, CA. The practice focuses on Contracts, Government, and Litigation. Dennis has over 22 years of legal experience. Currently practicing at Rogers Joseph O Donnell A Professional Corporation.
- Based in
- San Francisco, CA
- Experience
- over 22 years
- Known for
- Contracts · Government · Litigation
- Handles Contracts, Government, and Litigation matters from San Francisco, CA.
- Over 22 years of practice as a licensed attorney.
About Dennis Joseph Callahan: Dennis Joseph Callahan is an associate based in San Francisco, CA. The practice focuses on Contracts, Government, and Litigation. Dennis has over 22 years of legal experience. Currently practicing at Rogers Joseph O Donnell A Professional Corporation.
Areas of practice
Legal matters Dennis takes on
Dennis concentrates on contracts, government, and litigation. Each area below outlines the kind of case Dennis handles, typical outcomes to expect, and how the intake process starts.
Contracts
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Government
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Litigation
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Contracts cases in San Francisco, California
Dennis takes contracts matters in San Francisco, California. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dennis agrees to represent you.
Government cases in San Francisco, California
Dennis takes government matters in San Francisco, California. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dennis agrees to represent you.
Litigation cases in San Francisco, California
Dennis takes litigation matters in San Francisco, California. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dennis agrees to represent you.
Biography
Meet Dennis Joseph Callahan — contracts lawyer in San Francisco
Dennis Joseph Callahan is an associate based in San Francisco, CA. The practice focuses on Contracts, Government, and Litigation. Dennis has over 22 years of legal experience. Currently practicing at Rogers Joseph O Donnell A Professional Corporation.
Dennis Joseph Callahan is a lawyer practicing litigation, public law, government contracts and 2 other areas of law. Dennis received a M.B.A. degree from College of William & Mary in 2003, and has been licensed for 22 years. Dennis practices at Rogers Joseph O'Donnell A Professional Corporation in San Francisco, CA.
Working with Dennis on a contracts matter
Dennis Joseph Callahan is a lawyer practicing litigation, public law, government contracts and 2 other areas of law. Dennis received a M.B.A. degree from College of William & Mary in 2003, and has been licensed for 22 years. Dennis practices at Rogers Joseph O'Donnell A Professional Corporation in San Francisco, CA.
Who Dennis represents
Dennis reviews new inquiries case-by-case for contracts, government, and litigation matters in San Francisco and the surrounding California area.
Credentials
Education, bar admissions, and languages
College of William & Mary
J.D. · 2003
College of William & Mary
M.B.A. University · 2003
Jurisdictions
Dennis's state bar admissions
District of Columbia
2012 · ACTIVE
California
2007 · ACTIVE
New York
2004 · ACTIVE
Dennis studied at J.D. in College of William & Mary and M.B.A. University in College of William & Mary.
Law school and academic background
Dennis completed J.D. in College of William & Mary and M.B.A. University in College of William & Mary. Formal legal training is one signal of substantive knowledge — the day-to-day practice Dennis runs in California is where that training gets applied to real client questions.
Locations
Dennis Joseph Callahan's office in San Francisco
Dennis's primary office is at The Robert Dollar Building, 311 California Street, 10th Floor, San Francisco, CA, 94104-2695. In-person meetings are by appointment; a phone intake usually comes first.
Rogers Joseph O Donnell A Professional Corporation
The Robert Dollar Building, 311 California Street, 10th Floor
San Francisco, CA 94104-2695
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Schedule your consultationHiring guide
How to hire Dennis Joseph Callahan — what to expect in your first consultation
Working with a new contracts attorney should feel structured. Here's how the first two conversations with Dennis usually go, from the moment you request a consult to the day representation begins.
Consultation formats and pricing
Dennis charges for the initial consult. That fee is credited toward representation if you retain Dennis'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; Dennis will tell you what matters and what doesn't.
Questions to ask a contracts attorney in San Francisco, California
A short list to run through before you commit: How many contracts 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 Dennis
Dennis discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in contracts practice — ask which fits.
Hourly rates, contingency fees, and flat-fee options
Every contracts 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. Dennis confirms the model in the engagement letter before any work starts.
Payment methods and payment plans
Dennis's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many contracts practices work with clients on structured schedules.
Frequently asked
Frequently asked questions about Dennis Joseph Callahan
How much does it cost to hire Dennis for a contracts case?
Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Dennis walks through the likely range during the consult so there are no surprises.
Does Dennis offer a free consultation?
Dennis charges for the initial consult; that fee is credited toward representation if you retain Dennis's office. Some contracts attorneys offer free consults — check Dennis's current terms during booking.
How long do contracts cases in California typically take?
Simple contracts 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. Dennis gives a realistic estimate for your facts at the consult — vague answers here are a red flag.
Can Dennis take my case if I'm outside San Francisco?
Dennis is licensed in California. Matters governed by California law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Dennis 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 Dennis?
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. Dennis will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.
Is Dennis accepting new contracts clients right now?
Dennis's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.
Areas served
Contracts attorneys serving San Francisco, Los Angeles and San Diego in California
Dennis handles contracts matters throughout California. Each city below is a direct link into the search page for verified contracts attorneys in that community.
- San Francisco26,380 attorneys
- Los Angeles39,975 attorneys
- San Diego16,903 attorneys
- Sacramento10,561 attorneys
- Irvine6,831 attorneys
- Oakland5,709 attorneys
- San Jose5,009 attorneys
- Palo Alto4,084 attorneys
- Beverly Hills3,348 attorneys
- Newport Beach3,106 attorneys
- Pasadena2,894 attorneys
- Santa Monica2,756 attorneys
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