Cassity B. Gies standing in front of dark paneling, wearing a black blazer over a brown dress with a slit, and black high heels.
Cassity B. Gies smiling and wearing a black blazer, gold necklace, and a brown top, standing indoors against a dark background.

CASSITY B. GIES

OWNER, ATTORNEY AT LAW

Cassity is an experienced family law attorney with an undeniable passion for honest advocacy. Her time as an Oklahoma foster parent sparked an unwavering desire to protect children and families from the legal fallout that follows trauma and abuse.

With nearly a decade of additional experience in immigration, intimate partner violence, and juvenile law, Cassity holds an impressive and comprehensive understanding of collateral issues touching family law. She approaches family law with a mindful eye on the motivations and values that matter most to her clients.

Gray check marks stacked vertically on black background.
Macie Ervin, legal assistant to Cassity B. Gies at Sage Law PLLC in Oklahoma City, in beige blazer, white blouse, black pants, and white heels standing against dark wall.
Macie Ervin, legal assistant to Cassity B. Gies at Sage Law PLLC in Oklahoma City, wearing a tan blazer over a white top, smiling in front of a dark background.

MACIE ERVIN

LEGAL ASSISTANT

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PRESERVING A PIECE OF HISTORY

The seeds for Sage Law were planted long ago in Cassity’s earliest vision to build a firm that approaches family law in a professional, personal, and holistic way. As her practice expanded, so too did her vision – igniting exponentially the moment she saw the bones of 610 Colcord Drive.

Collage of images showing Cassity B. Gies during the renovation and construction of 610 Colcord Avenue in downtown Oklahoma City.

The historical significance of Sage Law’s office captivated Cassity as she grew to know D. Frank Plater, owner of Plater & Co., and the story behind his multi-generational law firm that occupied the two-story building across from the Civic Center for more than half a century.

In 2022, she leaned into her intuition and began the process of transforming this unique building into a comfortable space for clients to share and write their stories.

Collage of images showing Cassity Gies during the renovation of 610 Colcord Avenue in downtown Oklahoma City as it became Sage Law PPLC.

By prioritizing scaled accessibility and enhanced client connection, Sage Law’s design honors a corporate culture based on the power of “good vibes.” 

Cassity B. Gies standing with D. Frank Plater Jr. at the opening of Sage Law PLLC in Downtown Oklahoma City.
Business card for D. Frank Plater Jr., CPA, attorney, with contact information, legal services such as wills and estate planning, business representation, contract preparation, a map of the company's location, and illustrations of a gavel and quill.

From the archives:
Marketing brochure from Frank’s law firm.

Passing the Torch:
Cassity with Nancy Campbell, Mike Cole, and D. Frank Plater at the opening of the new office; christening Frank’s former office.

“I like the idea of finding another lawyer for the office, someone to appreciate the building and use it instead of turning it into another bar.”

- Frank D. Plater

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Accolades & Academics

Cassity graduated Suma Cum Laude from Oklahoma City University School of Law, earning seven CALI awards for Academic Excellence. She was a Hatton W. Sumners Scholar and received the J. William Congers Distinguished Student Award for her graduating class.

Cassity B. Gies received this blue competition ribbon with a gold center that reads 'CAI Excellence for the Future Award'.
Cassity B. Gies received this blue competition ribbon with a gold center that reads 'CAI Excellence for the Future Award'.
Cassity B. Gies received this blue competition ribbon with a gold center that reads 'CAI Excellence for the Future Award'.
Cassity B. Gies received this blue competition ribbon with a gold center that reads 'CAI Excellence for the Future Award'.
Cassity B. Gies received this blue competition ribbon with a gold center that reads 'CAI Excellence for the Future Award'.
Cassity B. Gies received this blue competition ribbon with a gold center that reads 'CAI Excellence for the Future Award'.
Cassity B. Gies received this blue competition ribbon with a gold center that reads 'CAI Excellence for the Future Award'.
Two awards Cassity B. Gies received from Oklahoma City University School of Law, one for Cassity Beatrice Reed and the other for Cassity Beatrice Reed, with a dark background.

During law school, she completed the Oklahoma Interdisciplinary Training Program on Child Abuse and Neglect, and championed for the reinstatement of the Child Abuse and Neglect program as a practicum course at OCU Law. Cassity began her law career at Mazaheri Law Firm before joining Phillips Murrah Family Law Group in 2019. She then went on to become Partner at Gunkel Law Group in 2023, before opening Sage Law in 2025.

Cassity has been designated a Super Lawyer® since 2023.

Cassity B. Gies was designated as a Super Lawyer in Oklahoma City in the area of family law.

Through the Grapevine…

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“Outstanding Law Firm! They put you first, they protect your family.  Cassity knows the laws and got me to trial quickly, affectively, and fought for everything I deserved and wanted.”

- NANCY M.

The image shows a check, with the Pay to the Order of line filled out for A. N. Other, dated 10/19/23, written for $19.23, with a signature and bank details.

“Cassity Gies is the best!!! She is like Elle Woods 💁🏼‍♀️ I never even had to see the judge. I definitely recommend her 1000% amazing.”

- ARIEL R.

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