Gillian Fierer O'Nan
also known as Gillian Fierer, Gillian Fierer
About Gillian
Biography
Gillian Fierer is an Atlanta family law attorney experienced in all aspects of family law, having dedicated her entire career to practicing family law. Gillian provides effective, resourceful, and responsive representation in a wide range of family law matters including divorce actions, separate maintenance actions, alimony and spousal support actions, child custody and support actions, contempt actions, post-divorce modification and enforcement, adoptions, family violence actions, legitimation actions, prenuptial and postnuptial agreements, and wills.
Gillian understands that the emotional and financial consequences of family law litigation can be devastating for parties and children. Therefore, Gillian takes pride in her ability to resolve even the most complex disputes in a civil manner while protecting her clients’ parental rights, property interests and the best interests of the child. Gillian also realizes that despite highly skilled negotiations some cases must go to trial. In those cases, Gillian has the experience and training to tenaciously pursue her clients’ best interests in the courtroom.
In adherence to her core values, Gillian believes that she can only obtain excellent results with ethical practice. She treats her clients with respect and compassion. Gillian will strive to find a resolution to your case that will protect your children, maximize your financial security and promote a positive future for you and your family. As a sole practitioner, Gillian will provide individualized attention to your case, responding to you directly and quickly, and providing you with thorough and individualized attention. Gillian will listen to you, provide you with options, and keep you informed every step of the way. No matter how simple or complex your case is, her goal is to maximize outcomes and minimize costs while providing you with comfort and guidance during this most difficult time in your life. As a mother of three, Gillian is extremely child-focused, and will work diligently to protect the interests of your children, minimizing the amount of trauma that they experience during this process.
When you are ready, please give Gillian a call to arrange a confidential consultation. Gillian is happy to assist you with any divorce or family law related matter in the Atlanta area, as well as any family law matter in the surrounding counties.
Practice Areas
5
Practice Areas
Fees and Rates
Cost
Always
Payment Methods
- Cash
- Check
- Credit Card
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Chat withLicenses
Licensed in Georgia for 19 years
State: Georgia
Acquired: 2006
No misconduct found
Location
Fierer & Buerlein, LLC
38 Old Ivy Road, NE, Suite 200, Atlanta, GA, 30342
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Gillian Fierer O'Nan's Reviews
Showing 1 - 5 of 111 client reviews from Avvo
Posted by Piari | October 9, 2025 | Hired Attorney
Grateful beyond words for Gillian Fierer and her incredible team.
After initially hiring a highly recommended male attorney for an uncontested divorce, I soon found myself needing to pivot when it became clear that our divorce required contested representation. I felt disheartened and unsure until a friend, who wished she had used Gillian herself, recommended her t...
Posted by Anonymous | December 22, 2024 | Hired Attorney
Garbage
Wasted time - truly ineffective and distracted Over charged - several times time calculations were found incorrect Couldn’t keep up with paralegal communications Overwhelmed - zero personal touch / treated us like a number
Posted by Brooke | September 6, 2024 | Hired Attorney
Highly Recommend
Gillian was wonderful to work with. She was knowledgeable, helpful, and straightforward with the entire divorce. She answered all questions thoroughly and was truly a great ally during the process. I highly recommend her.
Posted by Zach | September 4, 2024 | Hired Attorney
Outstanding Lawyer
Gillian is a bulldog. She fights vigorously for her clients and goes out of her way to provide top notch communication and support. She is more than a lawyer. She is an advocate in every sense of the word. Not only did I hire her, but I recommend her to everyone asking for a determined lawyer unafrai...
Posted by anonymous | August 9, 2024 | Hired Attorney
Horrible Experience
I could go on and on as to why a person should NOT hire this woman for legal counsel but honestly the thought of writing it all out is too exhausting. I don’t know how this woman can lay her head down and night . Horrible person, horrible lawyer. Don’t waste your money or time on her.
Gillian Fierer O'Nan's Lawyer Endorsements
"Gillian is professional and a strong advocate for her client. She is an outstanding family law attorney."
"I have worked with Gillian on several cases and she is always prompt and professional."
"I endorse this lawyer."
"Gillian is a smart and hard-working attorney that cares deeply for her clients. Without hesitation, I would recommend any of my clients to her. She is experienced, well-trained, and simply one of the best."
"I served as GAL on a case where Ms. O'Nan represented a party. Ms. O'Nan was professional and tenacious in her representation both inside and outside of the courtroom. I highly recommend Ms. O'Nan for her knowledge of the laws and process and her strong advocacy for her clients."
"I have had cases opposing Gillian and have referred many cases to her over the years. She is the ultimate professional - she is easy to work with and very courteous. She understands professionalism which makes the entire litigation experience much more pleasant for our clients."
"I highly recommend Gillian for any family law cases. She is a brilliant attorney with very diverse experience. Most importantly, she will always pursue what is in the best interest of her clients."
"I endorse this lawyer."
"Gillian is the archetype of the kind of attorney that makes children want to grow up to be attorneys. She is ethical, uniquely capable, brilliant, compassionate, and wise. I would not hesitate to send a member of my own family (if God forbid anyone needed a family lawyer) to Gillian. To the extent the law is still regarded as an admirable profession, it is because lawyers like Gillian exist."
"Gillian is an intelligent and effective attorney that provides cost effective representation that is not geared toward fee generation. I would highly recommend her to anyone seeking a domestic relations attorney."
"I have known Gillian for several years. It is rare to find an attorney to whom you can refer your valued clients. I have referred clients to Gillian with great results. I am happy to endorse Gillian, and gladly recommend her to anyone seeking an ethical and compassionate family law attorney."
"Without question, Gillian is one of the top family law attorneys I know. Her attention to detail and compassionate representation for her clients is exemplary. I highly recommend Gillian and her firm."
"I endorse Gillian. She is a highly skilled attorney that is well respected in the legal community."
Family lawyer
Estate planning lawyer
Family lawyer
Personal injury lawyer
Experience
Honors
2014
"Attorneys to Watch in 2014", Honorable Mention, Attorney at Law Magazine, Atlanta Edition
2014
Rising Star, Georgia Super Lawyers
2014
Top 10 Attorneys Under 40, National Academy Of Family Law Attorneys
2014
AV Peer Review Rating, Martindale-Hubbell
2014
Preeminent 5.0 out of 5, Martindale-Hubbell
2014
Legal Elite, Georgia Trend Magazine
2003
"Best Attorney" Award, Mock Trial, Kilpatrick Stockton
Work Experience
2018 - Present
Managing Partner, Fierer & Buerlein, LLC
2014 - Present
Founding Partner, Elovitz/O'Nan, LLC
2013 - Present
Founding Partner, Gillian Fierer O'Nan, P.C.
2008 - 2012
Associate, Levine, Smith, Snider & Wilson
2006 - 2008
Associate, Weinstock & Scavo, PC
Associations
2014 - Present
Cobb County Superior CourtGuardian ad Litem
2014 - Present
Civil MediatorCivil Mediator
2013 - Present
State Bar of Georgia, Transition into Law Practice ProgramMentor
2013 - Present
Lawyers Club of AtlantaMember
2010 - Present
American Bar Association, Family Law SectionMember
2008 - Present
State Bar of Georgia, Family Law SectionMember
2008 - Present
Atlanta Volunteer Lawyers FoundationGuardian ad Litem
2007 - Present
Atlanta Bar Association, Family Law SectionMember
2010 - 2011
State Bar of Georgia, Family Law SectionExecutive Committee Member
2010 - 2011
State Bar of Georgia, Young Lawyers DIvision, Family Law CommitteePresident
2008 - 2010
State Bar of Georgia, Young Lawyers DIvision, Family Law CommitteeEvent Chair, Supreme Cork
Sample of Legal Cases
Successful
Education
2006
JD - Juris Doctor
2002
BA - Bachelor of Arts
Speaking Engagements
2015
Hardman v. Hardman- Res Judicata in Divorce Cases
Publications
2011
Languages
English