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Joseph Sean Dumm

Business Attorney at SAN CLEMENTE, CA

5.0   15 reviews

also known as J. Sean Dumm, Sean Dumm

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About Joseph

Learn Joseph’s areas of practice.

Practice areas
  1. Business
    Entity Formation, Contracts, Business Transactions, Buy and Sell Agreement, Intellectual Property, Partnership Agreements, Risk Management Counseling

    14 years

  2. Estate planning
    Living Trusts, Wills, Advanced Health Care Directives, Durable Powers of Attorney, Irrevocable Life Insurance Trusts,

    12 years

  3. Health care
    Representing dental practitioners is both a specialty and a passion of Sean’s. His understanding of the specific challenges and issues in the dental field provides his clients with an important advantage.

  4. Commercial real estate
    Transactions, Boundary Disputes, Easements, Adverse Possession. I'm very familiar with the complex legal issues involving real estate transactions and disputes.

  5. Administrative law
    Wage and Hour Claims, Professional Boards (Dentistry), Representation of Attorneys in State Bar Court.

    23 years

J. Sean Dumm has an impressive, multi-discipline background that uniquely positions him to assist clients with a wide variety of legal issues. He has worked successfully in both private practice and as in-house counsel for a Fortune 150 company. He has served as lead counsel in an array of matters of business and intellectual property disputes.


Sean has a significant track record as a litigator as well, including First Chair jury trial experience and extensive administrative hearing experience. He also has a background in appellate advocacy, having prevailed in arguments presented to the California and Missouri Courts of Appeal. He has successfully represented attorneys in front of the California State Bar numerous times. He is admitted in California, Kansas and Missouri.


Sean now draws on his decades of experience to deliver personalized, expert representation to business owners, dental practitioners and those seeking counsel with estate planning and asset protection. He also uses his litigation background in the preparation of document to avoid ambiguities and to anticipate issues that might later become the subject of disputes. He practices law with a commitment to integrity and a high level of client service.


Sean graduated with honors from Washburn University School of Law, where he served on the Editorial Board of the Washburn Law Journal.  He received his Bachelors of Arts from the University of Iowa. He currently resides in Orange County, CA, with his wife and children.

Licensed for 22 years
State CA
Status Active
Acquired 2011
Updated 12/01/2022
State MO
Status Inactive
Acquired 2002
Updated 01/01/2023
State KS
Status Inactive
Acquired 2000
Updated 11/08/2022

We have not found any instances of professional misconduct for this lawyer.

Contact Joseph

Law Offices of J. Sean Dumm
Suite 204


5.0 / 5.0
  15 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by Sean | December 1, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Extended service after contract was finalized
Excellent service, I had Sean help me with my Dental office acquisition, he was very thorough with all the process and even after closing helped me with my questions. Recommended to all Dentists buying or selling their offices
Posted by Pam | January 14, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Excellent attorney
I worked with Sean many years ago and was completely satisfied with the family Trust he created for me. He was easy to reach and available throughout the process. Years later I found myself in an unfortunate situation with a relative contesting a foundational portion of the trust. Sean was called to testify at trial and his professionalism and ethical recall of the prior work was noted by the Judge and I am confident contributed to the positive outcome of the final judgement. This was a true test of making the right choice in an attorney!
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Posted by Daniel | December 4, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Job Well Done
Sean helped me with the purchase of my first dental practice. He was very informative and helpful during the process. I believe my acquisition was a little more complex than average but he was thorough and helpful throughout. I would definitely recommend Sean, good guy and fun to work with.
Posted by Brent | December 4, 2019
This review is from a person who hired this attorney.
| Hired Attorney
General Dentist
Sean did a great job of helping me establish my S-corp and review my associate contracts. He kindly guided me through the process and ensured I felt comfortable. I would recommended him to any dentist look for a lawyer.
Posted by Paulette | November 16, 2019
This review is from a person who hired this attorney.
| Hired Attorney
We could not have done this deal without him
Mr. Dumm came highly rated and respected. I highly recommend Mr. Dumm to any dentist looking to purchase a dental practice. He will look out for your best interest. We appreciate his hard work and knowledge and looking out for our best interest. It’s important to consult with a lawyer before placing an offer on a practice. Mr Dumm always answers the phone himself. He spends a lot of time on the lease and purchase agreement and understands dental practice purchases.
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Posted by Mark | August 24, 2019
This review is from a person who hired this attorney.
| Hired Attorney
An excellent professional to help sell your dental office
Sean was a great help in all aspects of our sales transaction. Right from the start he smoothly guided us through each step of all the negotiations, contracts and legal aspects. He was accessible and quick to return our calls. He was always focused and calm during the tough negotiations with the buyers. Sean will be my choice in any future business transactions.
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Posted by Zeynep | August 10, 2019
This review is from a person who hired this attorney.
| Hired Attorney
My dental attorney
Sean Dumm exemplifies what a dental attorney should be- experienced, easy to talk to, knows the dental field and just plain sharp about law in dentistry. He helped me all the way from being an associate reviewing contracts and agreements to the big stuff with my first practice acquisition. I was so confident when he reached out to landlords and other attorneys knowing that he has my best interest in mind and knew what to do at all times. I fully recommend him and continue to retain him as my attorney.
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Posted by Teny | July 30, 2019
This review is from a person who hired this attorney.
| Hired Attorney
My first dental practice!
Sean was a huge help in purchasing my first dental practice, which actually closed escrow today! He is very intelligent, experienced in his line of work, attentive, and very quick in replying to emails and phone calls. Being a first-time owner, there were so many things I didn't know and Sean was very patient. I believe that is very critical. The experience of buying an office is not easy and anxiety runs high. You need someone to keep you calm and walk you through it all!
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Posted by Bruce | November 30, 2017
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Gotta love him
My first contact with Mr. Dumm was 2/24/15 and after nearly three years feel confident enough to recommend his services. Sean is a thoughtful, level-headed, down to Earth kind of guy. He's easy to talk to which is probably why he is such a successful attorney...he makes you feel comfortable, he genuinely cares and takes an interest in people. It's important to trust your legal counsel but it's rare to also like your attorney and that's the unique thing about Sean. He's just good people and as reliable as they come. He honors is commitments 100% of the time, is accessible and reliable and his words can be taken at face value. I like how direct he is...he speaks with a clarity that is hard to find these days and he remembers everything, a talent I wish I shared. My advice to people is to give Sean a call...he offers complimentary consultations and after chatting with him for a too will understand why he is so popular. He's the kind of guy you WANT to refer to others...for THEIR benefit, not his.
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Posted by Laurie | October 11, 2017
This review is from a person who hired this attorney.
| Hired Attorney
A+ experience
Used J. Sean Dumm when I sold my dental practice. He 1) listened to my concerns, 2) protected my interests, 3) was easy to get a hold of, 4) very fair in his billing-ever felt "nickel and dimed" like when I worked with another dental attorney. 5) would work with him again in a heartbeat. 6) have already recommended him to several other colleagues
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Posted by Virginia | February 27, 2017
This review is from a person who hired this attorney.
| Hired Attorney
My review of J. Sean Dumm
Dependable, knowledgeable, a real professional and trustworthy are the qualities that make a good lawyer. Sean has all these and more! As a dentist, I knew I needed someone specifically familiar with the dental practice law to help me. Not only did he keep me well informed every step of the way, he also promptly and diligently responded to all my queries. I am very satisfied with the services he provided me and very highly recommend him. Excellent choice!
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Posted by Cristen | April 14, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Finally! An attorney who actually gets dentists!
Sean is truly a notch above excellent. Reasonable fees, quick response time, rock solid legal advice and contracts. I had Sean work up my legal documents when I bought my practice as well as when I needed to hire an associate for maternity leave. Both times he made the experience enjoyable. Can you believe it? I was confident in his abilities and trusted that he wouldn't complicate things just to make a little more money off me. I had an attorney before Sean that just threw a generic contract at me and told me to sign it then wanted to charge me to change a name in the document when I hired a different associate! I was so relieved when I hired Sean and he asked me questions about my personal situation and catered my contract to it. Plus, he's witty and charming!
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Posted by Sam | April 8, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Dental Practice acquisition and partnership arrangement
Sean was extremely knowledgeable and helped us acquire the dental practice without any difficulties. He was very good at explaining every process in detail. He was always quick to respond to all of our questions in a timely manner. What was best was that he has followed up with us even after we acquired the practice, to see how our office has been doing. I would highly recommend him to anyone that is going through a dental practice acquisition as he really understands the specifics involved in every step. He goes out of his way to make sure that you are fully informed and know exactly what you are getting into. Thank you Sean for
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Posted by Ted | August 26, 2015
This review is from a person who hired this attorney.
| Hired Attorney
Makes doing the right thing seem easy.
Sean's knowledge about current law and policy really helped us navigate the labyrinth of choices we had to make putting our trust together. His expert guidance and easy manner gave us the confidence that we went in the right direction to achieve the results we were looking for.
Posted by John | February 6, 2015
Outstanding Service
Sean is clearly a people oriented person who likes to entertain any questions you may have regarding your estate planning. He provided responsive service and a finished product (estate trust) that far exceeded my expectations. He also gave simple step-by-step instructions for my heirs as to how to proceed in the event they needed to take over my affairs. His attention to detail is fastidious and gave me great peace of mind knowing that all contingencies have been met. I highly recommend him for the legal services of estate planning. Sincerely, John.
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  • Free Consultation 30 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 7.0 (Very Good)

Work Experience

  • Attorney
  • Borchard & Callahan, APC
  • 2012 - 2014
  • Senior Staff Legal Attorney
  • The Hartford Insurance Company
  • 2006 - 2012
  • Attorney
  • Foland, Wickens, Eisfelder, Roper & Hofer, PC
  • 2002 - 2006


  • Washburn University School of Law
  • JD - Juris Doctor with Honors
  • 2000
  • University of Iowa
  • BA - Bachelor of Arts
  • 1996

Legal Cases

  • Monex Deposit Co. v. Parsons
  • Affirmed


  • State Bar of California, Trusts and Estates Section
  • Member
  • 2016 - Present
  • Missouri State Bar Association
  • Member
  • 2002 - Present

Languages Spoken

  • English


  • Client's Choice
  • Avvo
  • 2019


  • Washburn Law Journal
  • Editorial Board
  • 2000

Attorney endorsements

Received (1)
Given (0)
Endorse Joseph
Corporate and incorporation Attorney | Dec 05
Relationship: Worked together on matter
"I've worked with Sean on several matters. He is an excellent attorney."
This attorney hasn't created any attorney endorsements recently on Avvo.