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Insurance litigator Marisa O’Sullivan has joined Carrington, Coleman, Sloman & Blumenthal, LLP as a partner in the firm’s Dallas office.

“Marisa has distinguished herself at the forefront of the exceedingly important practice of insurance coverage law. We are excited to add an attorney with her industry and professional leadership experience to the firm,” said Carrington Coleman Managing Partner Monica Latin.

Over the course of her career, Ms. O’Sullivan has served as coverage counsel to commercial clients in a variety of industries including technology, hospitality, real estate, manufacturing, transportation, aviation, security, and retail. In addition to coverage litigation, Ms. O’Sullivan advocates for her clients facing claim handling disputes, claim resolution problems, and policy procurement or renewal issues. She has published several articles and led seminars for both in-house counsel and bar organizations on a range of insurance and litigation topics, including business risk insurance, cyber insurance, and e-discovery.

“Marisa has earned a reputation for creative problem solving in her advocacy for clients,” said Lyndon Bittle, head of the firm’s Insurance Group. “She will be a tremendous asset in meeting the complex needs of our clients and continuing to grow our insurance group.”

Named the Dallas Association of Young Lawyers’ Outstanding Young Lawyer of the Year in 2019, her work has earned recognition from Thomson Reuters’ Texas Super Lawyers Rising Stars. She has also been listed by D Magazine as one of the Best Lawyers in the field of insurance law and the Best Lawyers Under 40 in Dallas.

A Dallas Association of Young Lawyers Foundation and Dallas Bar Association Foundation Fellow, she currently serves on the boards of the Dallas Bar Association and Dallas Women Lawyers Association. She is slated to serve as President of the Dallas Women Lawyers Association in 2022.

Ms. O’Sullivan earned her law degree, cum laude, from Southern Methodist University Dedman School of Law. She earned her undergraduate degree, magna cum laude, from the University of Missouri.


Carrington Coleman has been selected by the prestigious Chambers USA legal guide among Texas’ top firms for its commercial litigation practice.

According to Chambers, the firm was selected based upon its handling of a wide variety of matters, including breach of contract, oil & gas, securities, employment, and construction disputes, in trials, appeals, and alternative dispute resolution.

One source interviewed by Chambers described the firm’s litigation team as “cohesive and dedicated to the client’s success.”

The firm, one said, is dedicated to finding “client-oriented solutions and problem solving.”

Managing Partner Monica Latin and Partner Alex More also earned individual recognition for their litigation work.

Mr. More earned praise from clients as a “pragmatic thinker” who “combines legal knowledge with strategic acumen” for his work related to fiduciary duty, securities and fraud-related disputes.

Calling Ms. Latin a “brilliant strategist with very strong analytical powers and superb litigation skills” for her work on complex commercial disputes at the trial and appellate levels, another client concluded: “She is a great litigator.”

The Chambers USA guide is produced by London-based Chambers and Partners, known worldwide for its thorough guides to the legal profession. Selection is based on thousands of attorney and client interviews to identify lawyers who demonstrate top technical legal ability, professional conduct, client service, commitment, and other key qualities.


We are honored to announce our attorneys that have been selected to D Magazine’s “Best Lawyers in Dallas 2021.” Carrington Coleman attorneys named to the exclusive list are: Cathy Altman, Construction Litigation; David Drumm, Real Estate; Whitney Keltch Green, Family Law; Kelli Hinson, Professional Nonmedical Liability Litigation; Monica Latin, Business/Commercial Litigation; Christie Newkirk, Labor & Employment; and Mike Sutherland, Bankruptcy & Workout.

Attorneys are first nominated for “Best Lawyers in Dallas” by their peers. Once nominated, a panel of attorneys reviews the nominations and selects the top attorneys in their practice area to compile The D Magazine “Best Lawyers” list. The complete list of Best Lawyers in Dallas is featured in the May edition of D Magazine and is available at

Whitney Keltch Green was also named to D Magazine’s 2021 “Best Lawyers Under 40 in Dallas” list, along with Carrington Coleman attorneys Alex More and Andrea Perez.


Carrington Coleman is pleased to announce that six Carrington Coleman attorneys have been named “Rising Stars” by Super Lawyers. “Rising Stars” selection is a reflection of individual professional excellence, recognized by their peers. The Rising Stars list recognizes no more than 2.5 percent of attorneys in each state. To be eligible for inclusion in Rising Stars, a candidate must be either 40 years old or younger, or in practice for ten years or less.

Carrington Coleman “Rising Stars” and the area of law they were recognized in:
Parker GrahamEmployment & Labor
Whitney Keltch GreenFamily Law
Alex MoreSecurities Litigation
Debrán O’NeilBusiness Litigation
Andrea PerezBusiness & Corporate
Brent RubinBusiness Litigation

Debrán O’Neil had the additional distinction of being named to the Top 50 Up-and-Coming Women and the Top 100 Up-and-Coming lists.


Whitney Keltch Green, Alex More, and Andrea Perez were recognized as D Magazine’s 2021 Best Lawyers Under 40. D Magazine asks for nominations that keep the following question in mind: “Which lawyers under 40, of those whose work you have witnessed firsthand, would you rank among the current best?” A panel consisting of esteemed lawyers of varying ages and varying levels of experience make evaluations and a final selection of the best lawyers under 40 in the DFW area.

Whitney’s areas of concentration include divorce, child custody/support disputes, modification of prior orders, adoptions, premarital agreements, and enforcements. She also serves as the 2021 President of the Dallas Association of Young Lawyers.

Alex practices in high-stakes litigation involving securities and fiduciary duty issues.  When not in court, he also serves as off-site General Counsel to businesses and entrepreneurs.

Andrea concentrates her practice in the fields of art law, business law, and intellectual property.

To learn more about Whitney, Alex, and Andrea‘s practices, please visit their bios by clicking their names.