Skip to main content

Heather Jo Mattes

Criminal defense Attorney at West Chester, PA

4.3   11 reviews

also known as Heather J. Mattes, Heather Mattes

  • Licensed for 39 years
    State PA
    Acquired 1984
    Active No misconduct found

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

About Heather

Learn Heather’s areas of practice.

Practice area
  1. Criminal defense
    Thirty two years experience in criminal law. Heather Mattes has practiced as a prosecutor and defense attorney during her career.

    40 years

Heather J. Mattes is an experienced criminal lawyer. She was born in Philadelphia, Pennsylvania and has lived and practiced here throughout her career. Ms. Mattes grew up in Delaware County where she attended public school and participated in the music program graduating as a national honor society member. In 2003, she was inducted into Sun Valley’s “Wall of Fame.”

Ms. Mattes attended The Pennsylvania State University where she graduated Summa Cum Laude with a degree in Communications Studies emphasizing ethics and philosophy. She graduated from the Villanova University School of Law and began her early practice as an Assistant Public Defender in West Chester, Pennsylvania for three years defending indigent clients at all levels of prosecution and in the state appellate courts.

For sixteen years, Ms. Mattes was an Assistant District Attorney in Delaware County, Pennsylvania where she tried misdemeanor and felony cases from driving under the influence to capital homicide as well as sexual assault and other special victim matters. She mentored and supervised other attorneys during her tenure.

Since 2005, Ms. Mattes has limited her practice to criminal defense in the state and federal courts. She is a member of the federal Criminal Justice Panel, the Pennsylvania Bar Association as well as the National Criminal Defense Lawyers. Ms. Mattes was a member of the Board of Pennsylvania Criminal Defense Lawyers for six years and remains active with the organization. She received commendations in 2014 and 2016 for her work with PACDL. In 2019 and 2020, Heather was the President of the Delaware County Chapter of PACDL. 


Heather Jo Mattes
105 South High Street, Suite 2A
West Chester, PA, 19382

Criminal Defense lawyers nearby


4.3 / 5.0
  11 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by anonymous | February 22, 2024
This review is from a person who hired this attorney.
| Hired Attorney
Highly recommend!
Heather is a committed criminal defense attorney with extensive expertise in her field. She possesses a wide range of experience both in criminal defense and prosecution, utilizing her experience to secure optimal results for her clients' cases. Heather consistently demonstrated thoroughness, preparedness, and transparency, ensuring I understood all potential outcomes throughout the process. Heather achieved an outstanding outcome for both my cases. I highly recommend Heather and would use her again if needed!
Read less
Posted by anonymous | October 30, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Heather Jo Mattes is the best lawyer in PA
Dedicated, hardworking, driven and worth every penny. Professor Heather Jo Mattes dives into your case and does everything in her power to fight for your rights. Professor Heather Jo Mattes is very well at conversing and negotiation for any circumstance. Highly recommend 100%. It is very rare to find someone who cares and will defend you the same way she would defend herself or her own family. Prof. Heather Jo Mattes would always be able to answer any of my questions that I would have. Prof. Heather Jo Mattes is the most talented and also conducts herself in the most professional way possible. 5 stars definitely !
Read less
Posted by anonymous | January 4, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Highly recommend Heather Mattes
I cannot say enough good things about working with Heather. My family engaged her for an emergency situation over Christmas week and she put her everything into our case. She was compassionate, thorough, straightforward and no-nonsense. She was responsive at all hours of the day and night - via email, phone and text. She went above and beyond for our family. I highly recommend her as a lawyer and professional. It is clear she is passionate about her craft and her clients. Her clients are lucky to have her. A++++.
Read less
Posted by Ivan | December 18, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Heather Jo Mattes
Heather Mattes,she is excellent doing her job,we hired her to represent my daughter,she did guide us through the whole process and got us what was the best choice,she is very professional and knows the judicial system and compassionate to her clients.Yes I do recommended
Posted by Matt | August 1, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Fantastic Criminal Attorney
I was facing multiple felony charges over the period of 18 months and she was very supportive and gave me direction. Highly knowledgeable on both sides of the law, defense and prosecuting sides. She is very dedicated to her clients and goes above and beyond to get a favorable outcome. Out of 16 charges, I was only convicted of two due to her knowledge, expertise, and commitment. All in all, I would highly recommend her for any charges especially serious or felony charges.
Read less
Posted by anonymous | April 17, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Excellent Criminal Defense Lawyer. Watching her do her job we were totally amazed!
We met for a consultation and immediately and hired Heather Mattes. She informed us what were the best and worst outcomes. Explained to us how everything worked before court proceedings and what to do. She was with us each step of the process. It is hard to explain until you're in a situation like we were but she is the lawyer I would want on our side for any legal situation. The day in court she was prepared and a true professional. She researched our case and knew every aspect of it. We were so impressed and so happy with the outcome. Heather Mattes is the lawyer you would definitely want to represent you. Thank you again for everything you did for us.
Read less
Posted by JB | January 14, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Complete faith in Heather
Heather's experience shines through in a court room. She seems to know everyone there and what their role is. At times seemed to direct them a bit when they seemed a little confused or in need of help. Even seemed to know their job better than they did (she likely had been in their role in the past). She knew every step before it happened. Her preperation was right on. She works very hard, thinks fast and gets results. If she doesn't get the results she wants the first time, she will not give up until she does. I have no idea how, but she does get unbelievable results. She is smart, sharp as a tack and tough as nails. On top of it I truly feel she is a really good person who will do the right thing and really fight for you....and win. Things were not going well for me and I was temporarily in a bad way due to certain circumstances in my life. It seemed I wasn't going to get any breaks from the courts. Heather worked hard and got me the break I needed to pull my life together and headed in a much better direction. She has no idea what a difference she has made in my life. Even when I told her she was very, very modest about it (well she is very professional and maybe she just being her professional self). I am very greatful for what she has done for me and fortunate that she was referred to me. She is truly an amazing attorney. There would never be a reason to contact any other lawyer. Obviously I would recommend ger to anyone who needs results. Thank you Heather!
Read less
Posted by CK | August 21, 2014
Exceptional Juvenile Justice Attorney
Heather is very honest, intelligent, straight - forward, caring and knowledgeable. My son was involved in multiple systems and Heather has exceptional talent in dealing with mental health/special education and criminal justice. I met her years ago on a professional level, and when my son got into trouble she was the first person who came to mind. She is fabulous!
Read less
Posted by anonymous | February 9, 2012
Excellent Criminal Defense Attorney
Heather is very thorough and always honest about possible outcomes. I would use her again if needed
Posted by Gloria | December 18, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Extremely Dissappointed
Although Heather is a nice person to talk to, I am very disappointed in the way that she handled the little bit of work, (if you want to call it that) and then keep my money . Yes it is true that her contract reads that your retainer is non-refundable and I signed the contract without really reading it, I would think that a person of her stature would be humane enough and kind enough to not keep over one thousand dollars of a persons money when she did not do anything but make a couple of phone calls that she claims no one answers the phone, yet the same number my pastor called and always reached a human and not want to keep that persons money. What I needed her to help me with for my son, she did not accomplish. My pastor accomplished it in a couple of days and she had the case for weeks and did not get any of the things that my pastor was able to do without an attorney. When I learned that my pastor was able to do what I basically hired her to do, I immediately contacted her and told her it was taken care of by my pastor and I asked about a refund and that is when she told me that the money was non refundable except for $500.00. I would think that an attorney that is out here to help the people would know that she really doesn't deserve to keep my money because she did not do the work, yet she kept my money and no matter what I say she will not be kind and human and do what I think any good natured person would do and admit that they did not do anything to deserve keeping such a large amount of money from a hard working mother trying to help her son who is locked up. Basically I feel that I was legally robbed. There is just no way that I would feel right to keep a persons money knowing good and well that I really did not do anything to deserve it. I am going to go on to say that I am sure this is not the first time someone has given an attorney money to retain them and realize that they don't need them. I just really feel cheated and abused financially. I will never recommend this attorney and I will continue to write a review about her and how she legally took my money on a technicallity I guess you can say. So so sad.
Read less
Response from Heather Mattes December 19, 2017
All services in this case were fully discussed prior to providing a written fee agreement and fulfilled when retained. Ethical attorneys employ written fee agreements and encourage potential clients to review them before signing. The Law Offices of Heather J. Mattes charged a minimal retainer in this matter. Ms. Mattes performed services for which she was retained and additional work to assist the client including successfully contacting prison authorities, clarifying issues related to the client's status and communicating in detail with the reviewer. Professional, superior service are always aspects of this office's representation.
Read less
Posted by anonymous | January 26, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Do not recommend
I would not recommend this attorney to defend you. She is a former Assistant DA. In our case, she was professional and helpful in her office before we paid her $2500 non refundable retainer. She said that she would bill her time at $350/ hour against the retainer. When we arrived in court 1 week later, she said my daughter had to plead to one of the lesser charges, even though she had told us in her office that the whole case against my daughter was BS. When we argued that we wanted all of the charges dismissed, she became defensive and combative and said "dont tell me how to do my job". The plaintant did not arrive, and the judge dismissed all charges. In short, this attorney was unprofessional and defensive. I do not recommend her.
Read less
Response from Heather Mattes January 28, 2017
It is regrettable this parent of a client misunderstood the conversation prior to the court hearing. The decision to enter a plea belongs to the client, not counsel. The review fails to acknowledge the attorney's patient efforts to explain the circumstances to him and the client, her advocacy on the client's behalf and the fact Ms. Mattes sought and obtained dismissal of the charges over the Commonwealth's objection. Ms. Mattes takes pride in providing superior service and zealous advocacy to every client and understanding to distraught parents when necessary. She has offered to discuss this matter further with the party privately.
Read less
View less reviews


  • Free Consultation 120 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 9.9 (Superb)

Work Experience

  • Adjunct Professor
  • Drexel University College of Medicine
  • 2006 - Present
  • Principal
  • Law Offices of Heather J. Mattes
  • 2006 - Present
  • Assistant District Attorney
  • Delaware County District Attorney's Office
  • 1989 - 2005
  • Assistant Public Defender
  • Chester County Public Defender's Office
  • 1985 - 1988
View all work experience


  • Villanova University School of Law
  • JD - Juris Doctor
  • 1984
  • Pennsylvania State University
  • Bachelor of Arts
  • 1981


  • National Association of Criminal Defense Lawyers
  • 2012 - Present
  • Homeowner's Association
  • Secretary
  • 2010 - Present
  • Delaware County Bar Association
  • 2010 - Present
  • Pennsylvania Bar Association
  • 2006 - Present
  • Chester County Bar Association
  • 2006 - Present
  • Delaware County Association of Criminal Defense La
  • President
  • 2019 - 2021
  • Pennsylvania Association of Criminal Defense Lawyers
  • Board of Directors
  • 2012 - 2020
  • American Bar Association
  • 2010 - 2021
View all associations

Languages Spoken

  • English

Honors and Awards

  • President's and Directors' Commendation
  • Pennsylvania Criminal Defense Association
  • 2016
  • Annual Award
  • Bikers Against Child abuse
  • 2004


  • PACDL: For the Defense
  • "Leap of Faith: Lessons Learned in My First Year of Practice"
  • 2016

Speaking Engagements

  • White Collar Seminar
  • Women In The Law
  • 2015

Attorney endorsements

Received (4)
Given (2)
Endorse Heather
DUI and DWI Attorney | Feb 09
Relationship: Fellow lawyer in community
"I'm a lawyer and if I got into trouble, I would hire her. I have known Heather for many years. She is the kind of lawyer that loves her job and takes pride in fighting for justice. She will stand by your side and know the law better than anyone else in the courtroom. In my opinion, she is one of the most talented and compassionate lawyers in the Commonwealth of Pennsylvania."
DUI and DWI Attorney | Mar 11
Relationship: Opposing Counsel on matter
"Heather is a professional, competent and diligent attorney who is well known in Chester County. Highly recommended"
Criminal defense Attorney | May 19
Relationship: Fellow lawyer in community
"I've known Heather Mattes to be a very well-prepared, knowledgeable and caring lawyer. She takes pride in doing good work. I highly recommend her!"
Criminal defense Attorney | Mar 11
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Criminal defense
Criminal defense

Avvo Contributions

1 Legal Answers 0 Legal Guides
West Chester Criminal defense Lawyer Heather Jo Mattes
Heather Jo Mattes
Criminal defense Attorney
West Chester, PA
Licensed for 39 years
Free Consultation