Sienna L.M. OstaCounsel

Primary Office

988 Woodcock Road
Suite 100
Orlando, FL 32803

Phone

689.208.0394

Professional Profile

Sienna L.M. Osta serves as counsel in Carr Allison’s Orlando (FL) office. Her practice focuses on the defense of premises liability and personal injury. She is admitted to practice in Florida and before the US District Court for the Middle and Southern Districts of Florida.

Sienna earned her Bachelor of Science in biomedical sciences with a minor in political science from the University of South Florida. She earned her Juris Doctor from Thomas M. Cooley Law School, where she served as class senator and received multiple awards, including the Book Award for appellate advocacy, negotiation skills and research and writing.

Sienna is a member of the Florida Bar Association, Florida Defense Lawyers Association (FLDA), the American Bar Association and the Orange County Bar Association. She also serves as Guardian ad Litem in the State of Florida and is a frequent speaker on topics such as domestic violence, legal reform and missing persons. Sienna has been a guest speaker for the Women’s March and numerous organizations throughout the state of Florida. She previously ran for the Florida State House and drafted proposed legislation addressing missing persons. She is also the creator of JUSTUS – Just Unapologetic, Shameless Transparency for a Better U.S. Her article, “The Importance of Jury Trials,” was published in Lawyer magazine.

Outside of her practice, Sienna enjoys mentoring law students, traveling, writing and spending time with her family.

Practice Areas

Admitted to Practice

Florida

US District Court, Middle and Southern Districts of Florida

Education

BS, University of South Florida

JD, Thomas M. Cooley Law School (FL)

Affiliations

Florida Bar Association

American Bar Association

Orange County Bar Association

Florida Defense Lawyers Association

News

Sausaman Granted a Summary Judgment

Alison H. Sausaman of our Jacksonville (FL) office won a recent appeal of an order granting Defendant’s motion for summary judgment on behalf of a convenience store. The Fifth District Court of Appeals affirmed the trial court’s order, which held that an undefined change in elevation where concrete met asphalt […]

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Summer 2026 Law Clerks

Carr Allison Welcomes 10 1Ls and 23 2Ls to the 2026 Summer Clerk Program!

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DeCoudres and Brown Granted a Summary Judgment

Shaun DeCoudres and Web Brown of our Birmingham (AL) office were granted summary judgment in Jefferson County (AL) on claims of negligent hiring, training and supervision in a death case involving a temp agency and tire wholesaler. Shaun and Web argued that the temp agency scans possible employees for placement […]

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