Overall Rating
This is an aggregated review score of Avvo and Lawyers.com reviews.
This is an aggregated review score of Avvo and Lawyers.com reviews.
5.0 /5.0
119 Client Reviews
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Diana Sladen
also known as Diana (Cortes) Sladen
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About Diana
Biography
For Attorney Diana Sladen, the most fundamental area of the law is the law that directly impacts the family. Practicing family law gives Attorney Sladen the chance to practice in an area that truly affects the everyday lives of her clients. She practices in all areas of family law including pre-nuptial matters, divorce, post-divorce actions, child custody, child support, enforcement actions, modification, adoption, paternity, LGBT families, military families and appeals. Attorney Sladen also handles guardianship matters in both probate and juvenile court. Attorney Sladen also handles most of the Department of Children and Family involvement in the office including: DCF representation during an investigation, DCF representation during an open case, DCF Fair Hearings, and Superior Court appeals for Fair Hearing decisions. Attorney Sladen has handled both interlocutory appeals and appeals in the Massachusetts Court of Appeals.
Attorney Sladen takes ownership of each case when a client retains her as their attorney. She strives to handle every case with great care, detail and responsibility. Attorney Sladen recognizes the importance of client care in her family law practice. She takes the time and pays close attention to develop specific and unique strategies to meet each client’s needs. She educates her clients on all available options so that her clients can make informed and cost-effective decisions.
Attorney Sladen has represented husbands, wives, mothers, fathers, grandparents, guardians and children. She has handled cases involving: mental health issues, substance abuse issues, domestic abuse and violence, interstate and international custody disputes, concurrent matters in family and juvenile court, parental alienation cases and actions involving military members.
Attorney Sladen is a member of the Worcester County Bar Association and Family Law Section. Attorney Sladen volunteers as a ARC Counsel for the Worcester County Probate and Family Court – representing and advocating on behalf of children in contested custody disputes. Attorney Sladen is also on the court approved list for Worcester County as a Category F Guardian ad Litem.
Attorney Sladen speaks Portuguese and Spanish. She is a graduate from Providence College with baccalaureate degrees in both Political Science and Philosophy. Attorney Sladen graduated from Roger Williams University School of Law. She is licensed to practice law in Massachusetts, Rhode Island Connecticut.
2025 Avvo Client's Choice Attorney. The experience that you need. The quality that your family deserves. Call now.
Practice Areas
6
Practice Areas
Divorce and Separation
40%
Child Custody
20%
Family
20%
15 years
Child Support
10%
Fees and Rates
Cost
Hourly Rates
$ 250-350 per hour
Payment Methods
- Cash
- Check
- Credit Card
Licenses
Licensed in Connecticut for 13 years
State: Connecticut
Acquired: 2012
No misconduct found
Licensed in Massachusetts for 14 years
State: Massachusetts
Acquired: 2011
No misconduct found
Licensed in Rhode Island for 14 years
State: Rhode Island
Acquired: 2011
No misconduct found
Location
Diana Sladen's Reviews
Filter Avvo Reviews (117)
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Practice Areas
Divorce & Separation (49)
Family (37)
Child Custody (30)
Lawsuits & Disputes (11)
Child Support (9)
Administrative Law (5)
Mediation (4)
Alimony (3)
Child Abuse (3)
Probate (3)
Appeals (2)
Adoption (1)
Domestic Violence (1)
Elder Law (1)
Litigation (1)
Residential (1)
State, Local And Municipal Law (1)
What Clients Mention
Showing 1 - 4 of 4 reviews | Mediation
Posted by Laura | June 06, 2025 | Hired Attorney | Mediation
Highly competent and very efficient.
When my divorce became excessively drawn out and contentious, the judge appointed Attorney Sladen to act as conciliator. Attorney Sladen demonstrated excellent listening skills and was able to confidently and efficiently guide us quickly to our divorce agreement. She demonstrated care and concern f...
Posted by R. | April 23, 2025 | Hired Attorney | Mediation
Strategic, Steady, and Always One Step Ahead
Attorney Diana Sladen of Sladen and Costigan in Shrewsbury, MA, was my attorney during one of the most difficult chapters of my life…my divorce. From the start, I asked for one thing: that we remain on offense, not defense. Diana exceeded it in every way. She guided me through a mediation process ...
Posted by anonymous | April 26, 2023 | Hired Attorney | Mediation
Definitely recommend
Diana managed to get my narcissistic husband to agree to a mediated agreement saving me thousands in court costs. He waivered often but she got it done. She also walked me off the ledge several times with great professionalism.
Posted by Keri | November 07, 2018 | Hired Attorney | Mediation
Amazing lawyer and person
Attorney Sladen was amazing! After several years of total conflict and coparenting disaster, she was able to get my son’s father to reasonable agreements that put my son first! We were able to walk out of mediation with an agreement without having to go to trial! Something I thought was going to be i...
Diana Sladen's Lawyer Endorsements
"I have known Attorney Sladen professionally for 6 years. Not only is she is highly skilled as a seasoned practitioner, she is a fierce advocate for her clients. I highly recommend and fully endorse her."
"Attorney Sladen generously gives her time to her client's and puts true passion into each case. She really treats every case as though it is her own family."
"I have known Diana personally and professionally for many years. She is extremely knowledgeable in the field of family law, professional and a fierce advocate for every client. Anyone would be lucky to have Diana as an attorney, I cannot endorse her enough!"
"Diana was opposing counsel on a hotly contested post-divorce modification. Despite the challenges of the case, Diana was always professional, cordial, and a zealous advocate for her client. I endorse Diana wholeheartedly."
"Attorney Sladen is a fantastic advocate for her clients. She puts her clients first, from the start of the case to the settlement, and ensures that the client receives the best results possible. I highly recommend Attorney Sladen."
"Diana's confident presence, her knowledge and passion for her profession make her one great attorney. I endorse this lawyer."
"Attorney Sladen brings a fresh perspective to any divorce or custody matter and is able to find the best solution for her clients in an expedient and cost effective manner. Her tenacity and attention to detail are beyond compare and lend to her high level of court room performance, as well as negotiating skills."
"Attorney Sladen makes herself available to aid both clients and fellow attorneys within the firm. Her willingness to help is compounded by her knowledge of Massachusetts, Rhode Island and Connecticut law."
"When it comes to navigating the new alimony statute she is one of the "go to" attorneys in the state."
Makayla Caliri
Child custody lawyer
Mary Beth Ayvazian
Family lawyer
Irena Inman
Family lawyer
P. Tyler Summers
Family lawyer
Patrick Grogan
Family lawyer
Laurel Barraco
Family lawyer
Dahlia Habashy Bonzagni
Unknown lawyer
Caitlin Costigan
Unknown lawyer
Mandy Hebert
Unknown lawyer
David Callahan
Divorce and separation lawyer
Experience
Honors
2025
2025 Rising Star, SuperLawyers
2025
Rising Star, Super Lawyers
2024
2024 Rising Star, SuperLawyers
2024
Rising Star, Super Lawyers
2023
2023 Rising Star, SuperLawyers
2023
Rising Star, Super Lawyers
2022
2022 Rising Star, SuperLawyers
2022
Rising Star, Super Lawyers
2019
Client's Choice, Avvo
2018
Client's Choice, Avvo
2017
Client's Choice, Avvo
Work Experience
2018 - Present
Owner, The Law Office of Diana M. Sladen
2016 - 2018
Attorney, Callahan, Barraco & Inman, P.C.
2015 - 2016
Attorney, Cordell & Cordell, P.C.
2011 - 2015
Senior Attorney, Pollack Law Group, P.C.
2010 - 2011
Law Clerk, Homonoff, Levine and Pulner
2009 - 2011
Associate Attorney, Miller & Caine LLP
Associations
2018 - Present
Worcester County Bar Association, Family Law SectiMember
2011 - Present
Worcester County Bar AssociationMember
2021 - 2025
Worcester County Bar Association Conciliation ProgramCo-chair
2018 - 2024
Rhode Island Bar AssociationMember
2011 - 2024
Rhode Island Family Court Bench Bar CommitteeMember
Education
2010
Roger Williams University School of Law
JD - Juris Doctor
2008
Providence College
B.A.-Philosophy + B.A. - Political Science
Speaking Engagements
2021
Paralegal's Guide to Divorce and Pre-nuptial Agreements
Legal Ethics in Family Law
2021
Paralegal's Guide to Divorce and Pre-nuptial Agreements
Smart Phones and Social Media Discovery in Divorce
2017
Divorce Seminar
Divorce in Massachusetts
Languages
Portuguese
Spanish
English