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also known as Greg
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A believer that hard work and determination can lead to amazing results, Greg has carried that approach through every stage of his career—and now brings it to helping clients plan for the future and protect what matters most.
Greg grew up in Brandon, Mississippi, and graduated from Belhaven University with a Bachelor’s Degree in Accounting. After graduation, Greg worked for a regional moving company as its office manager. However, Greg found his calling for the law when he made a career change, taking a position as a paralegal for a Jackson, Mississippi-based tax law firm. Greg used the skills he learned as a paralegal, working closely with clients, to further his legal career. He then finished his legal education at the University of North Dakota School of Law. During law school, Greg was a member of Law Review and represented his law school at a national appellate moot court competition. He also clerked for a Maricopa County Superior Court Judge, where he gained hands-on experience inside the courtroom.
After earning his Juris Doctorate, Greg began his legal career in employment law, assisting people through tumultuous and uncertain times. There, he honed his skills as a negotiator, helping numerous clients obtain severance packages after unexpected job loss. Greg then transitioned into commercial contract law, where he developed a strong foundation in litigation and advocacy, spending significant time in the courtroom and gaining insight into disputes.
Greg later focused his practice on family law, guiding clients through some of the most personal and emotionally complex challenges they will ever face. This experience sharpened his ability to manage expectations, navigate sensitive family dynamics, and develop practical, forward-looking solutions tailored to each client’s circumstances.
Today, Greg applies that same perspective to estate planning. His background in family law and tax law gives him a unique understanding of how conflict can arise, and how thoughtful planning can prevent it. He works closely with clients to create clear, effective estate plans that protect their families, preserve their assets, and provide peace of mind. Drawing on his experience in negotiation, litigation, and client counseling, Greg approaches estate planning with both precision and empathy, helping clients make informed decisions about their futures to help give them peace of mind.
When Greg is not working with clients to plan and protect their legacies, he enjoys spending time with his family. They enjoy traveling together and exploring Arizona. When he can, Greg can be found teeing it up on one of the valley’s numerous golf courses.
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Practice Areas
Free Consultation
$0 first 30 minutes
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State: Arizona
Acquired: 2020
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40 North Central Avenue, Suite 2300, Phoenix, AZ, 85004
dmcantor.com/about-dmc-flp/gregory-sinningOther places you can find Gregory online.
10 Client Reviews
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Showing 1 - 5 of 10 reviews
Posted by anonymous | August 16, 2025 | Hired Attorney
Attorney experience
Great experience so far. Gregory follows up promptly, addresses all issues at hand, and is an impressive attorney in the court room. We have been able to accomplish all of our desired tasks. I would highly recommend consulting Gregory and or his paralegal Cierra for any family law issues. Thank you....
Posted by anonymous | September 26, 2024 | Hired Attorney
Thank you Greg!
I cannot recommend Greg and Cierra highly enough for their exceptional support during my custody case. From our first consultation, I felt understood and supported. They took the time to listen to my concerns and clearly explained the legal process, which helped alleviate much of my anxiety. Greg’...
Posted by Donna Crocker | August 10, 2024 | Hired Attorney
Thank you
Grandparents can get rights and I did. I thank Greg Sinning and staff for all your help.
Posted by Janelle | May 21, 2024 | Hired Attorney
Highly Recommend!
I would highly recommend Greg Sinning and Cierra for any family law matter. They made the process simple and as stress free as possible. Greg is an extremely knowledgeable attorney and truly great to work with! Thank you both for your hard work.
Posted by Nicole M | August 23, 2023 | Hired Attorney
Gregory made a tough circumstance easy
Gregory Sinning and the amazing Paralegal team supported me during a tough child custody case. They are responsive and worked hard to protect my child and we recieved a postive outcome. I knew what was happening every step of the way and all my questions were answered. No one wants to fight for custo...
"Greg is a compassionate lawyer with an exceptional attention to detail. With a background in debt collection and family practice, Greg provides vast knowledge to his estate planning practice."
"Greg is a great advocate for his clients as proven by his results and his reputation within the legal community. I highly recommend Greg as an attorney and litigator."
"A highly dedicated and sharp-minded attorney, Greg consistently provides exceptional legal analysis and strategic counsel for our team."
"Greg is a formidable advocate who represents clients with skill and professionalism. I highly endorse him!"
"Greg is a zealous advocate for his clients producing outstanding results. I highly endorse this lawyer."
"I endorse this lawyer. Greg gives careful attention and consideration to every case and client he represents. He is well-prepared, zealous, and attentive; every client could benefit from Greg's representation."
Family lawyer
Family lawyer
Family lawyer
Family lawyer
2027
Super Lawyer, Super Lawyers
2026
Super Lawyer, Super Lawyers
2025
Rising Star, Super Lawyers
2025
Super Lawyer, Super Lawyers
2022 - Present
Family Law Attorney, Cantor Law Group
2020 - 2022
Attorney, Gurstel Law Firm, PC
2020 - 2020
Attorney, Law Office of Joshua Black, PLC
2019 - 2020
Law Clerk, Law Office of Joshua Black, PLC
2022 - Present
Maricopa County Bar Association – Family Law SectionMember
2022 - Present
State Bar of Arizona – Family Law SectionMember
2019
JD
2010
BS - Bachelor of Science
English