The Law Firm of Cushnie & McMahon

Accident Trial Attorneys

“Justice is more just with a lawyer you can trust”

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Proudly Serving Clients in Port St. Lucie, FL & the Treasure Coast

Today’s legal environment is competitive and complicated, so it is important to have a team of professional attorneys by your side to guide you and help you through every step of the process. With 30 years of experience, the attorneys at the Law Firm of Cushnie & McMahon represent victims of accidents in Port St. Lucie, the whole Treasure Coast and throughout Florida.

Our law practice specializes in a number of areas including: personal injury cases, wrongful death, medical malpractice, accident cases, and more. These can be the most complex cases you or one of your loved ones will go through. Our lawyers are ready to guide you through your case. Together they are dedicated to providing you with the best legal strategies and going the extra mile to help you resolve your case. We have years of courtroom experience and a proven track record of positive case results for our clients.

Big Firm Experience with Small Firm Personal Service & Attention

The Law Firm of Cushnie & McMahon offers each client personal attention and are committed to providing you with quality service. We recognize each client has individual needs pertaining to their life situation and case. Together with their staff, they work to address your specific needs and provide you with the personal attention you deserve.

Meet Colin C. Cushnie, Esquire

Mr. Cushnie has provided a range of legal services including personal injury law, wrongful death, civil litigation and family law since 1989. He was born in Kingston, Jamaica and moved with his family to Miami where he completed High School. He is a graduate of Florida International University with a Double Major in Marketing and International Business. He earned his Juris Doctorate from Nova Southeastern University and became a member of the Florida Bar. In addition, he is a member of the Port St. Lucie Bar Association and Caribbean Bar Association. Florida Rural Legal Services has awarded Mr. Cushnie the Pro Bono Award four times. This organization provides civil legal advice and representation for Low-income people and communities.

Florida International University, B.S.
Double Major Marketing/International Business
Nova Southeastern University, J.D.

Bar Memberships
Florida Bar, 1989

Professional Associations and Appointments

  • Caribbean Bar Association
  • Port St. Lucie Bar Association
  • Business Networking International


Community Involvement

  • Past Humane Society of Martin County Board Member
  • Past United Way of St. Lucie County Board Member

Honors and Awards

  • Honorary Member Caribbean Nurses Association of the Treasure Coast
  • Honorary Member of St. Lucie County Cricket Club
  • Florida Rural Legal Services, Inc.-Pro Bono Awardee. Florida Rural Legal Services is a non-profit organization which provides civil legal advice and representation for low-income people and communities.


If you have been injured by someone else’s negligence or have a family law matter, Mr. Cushnie is ready to provide you with the representation you need and to fight for the money compensation you deserve. Colin understands how hard and stressful a legal case can be and that is why he is ready to handle your entire case from start to finish.

Cushnie and McMahon law office
Paul P. McMahon, Esquire (Retired)

Now Retired, Mr. McMahon had over 25 years of experience as a trial lawyer on the Treasure Coast. He has been identified by legal organizations across the country as a top personal injury litigator. Mr. McMahon was formerly a partner in the nationally recognized Law Firm of Gary, Williams, Finney, Lewis, Watson & Sperando, P.L. before he and Mr. Cushnie joined forces creating Cushnie & McMahon, a smaller firm dedicated to personal service and attention. He is an experienced trial lawyer who has successfully handled cases throughout the state of Florida, and nationally.

Ohio State University, B.S., Double Major Economics/Marketing
University of Toledo College of Law, J.D.

Bar Memberships

  • Florida Bar, 1987, Member of Civil Litigation Section
  • US District Court Middle District of Florida
  • US District Court Southern District of Florida
  • US District Court Northern District of Florida
  • Fellow of The Florida Bar Foundation
  • Member, Martin County Bar Association
  • Member, St. Lucie County Bar Association
  • Member, Palm Beach County Bar Association
  • Fellow of the Florida Bar Foundation

Professional Associations, Appointments & Service

  • Fellow of the Florida Bar Foundation
  • The Million Dollar Advocates Forum –Awarded to Mr. McMahon for million and multi-million-dollar jury verdicts, settlements and arbitration awards in the areas of personal injury, medical malpractice, civil rights violations and business disputes. Less than 1% of U.S. lawyers are members.
  • The National Trial Lawyers Top 100 Trial Lawyers
  • American Board of Trial Advocates (ABOTA) Nominated and elected to membership June 20, 2012. ABOTA membership evidences high personal character, honorable reputation and proficiency as a trial lawyer.
  • Treasure Coast Justice Association – Founding Board Member 2014
  • Chairman, Martin County Bar Association Trial Lawyers Committee
  • President of St. Lucie County, FL Bar Association 1996-1997
  • Secretary/Treasurer of St. Lucie County, FL Bar Association 1994-1995
  • Chairman of St. Lucie County, FL Bar Association Law Week Committee 1994 – 1996
  • Appointed by the Supreme Court of Florida to the 19th Judicial Circuit Unlicensed Practice of Law Committee in 1994, appointed Chairman of the committee in 1996.
  • Member of Strathmore’s Who’s Who 2000
  • Speaker, “Florida Worker’s Compensation Law”, Indian River State College May 1993

Community Involvement Past & Present

  • Member of St. Bernadette’s
  • St. Lucie County Board of Directors & Legal Advisor for United Way
  • Francis K. Sweet School Business Partner and Advisory Council
  • Arts Council Board of Directors, Martin County
  • Board of Directors for the Friends of 440 Scholarship Fund, Inc.
  • Sons of the American Legion
  • Board of Directors Heronwood Homeowners Association

Honors and Awards

  • Eagle Scout Award, Boy Scouts of America and National Eagle Scout Association Member
  • The Ohio State University, Deans List Student
  • Chief Justice of Park Hall Judicial Committee, and Executive Council
  • American Jurisprudence Award for Civil Procedure II
  • Moot Court Team Award, 2nd Place Brief, 1986, Albert R. Mugel National Moot Court Tax Competition.
  • Florida Rural Legal Services, Inc. – Pro Bono Award, 1996. A non-profit organization which provides civil legal advice and representation for low-income people and communities.
  • Florida Rural Legal Services, Inc.- Pro Bono Award, 1996 and 2002. A non-profit organization which provides civil legal advice and representation for low-income and communities.
  • VFW Post #4194, Stuart, FL Recognition of Dedication and Support 2016
  • Treasure Coast Justice Association-Certificate of Appreciation for Contributions Made
  • Caribbean American Cultural Group-Outstanding Service Award-2017


Mr. McMahon is dedicated to helping all of his clients win their legal battles. If you are in need of help or have been hurt in an accident, give Paul a call today. Let his experience and knowledge guide you.

Meet Casey J Williams, Esquire

Casey attended Florida State University in Tallahassee, Florida, where he graduated in 2007 with a degree in Criminology. He then continued on to the University of Western Michigan Thomas Cooley Law School where he was heavily involved in student programs. While in law school, Casey worked as a judicial extern for the Chief Judge in Oakland County Circuit Court. As a second and third-year law student, Casey worked for the State Appellate Defender’s Office in Detroit, Michigan assisting in appeals due to negligence by the Detroit Crime Lab. During his time at the State Appellate Defender’s Office, Casey assisted in the appeal that saw the release of an innocent inmate after 8 years of incarceration. Casey specializes in the areas of personal injury, wrongful death arising from automobile accidents, and complex commercial litigation.

Casey is admitted to practice law in the State of Florida; the Eleventh Circuit Court of Appeals; the Southern District Court of Florida, the Middle District Court of Florida, and the Northern District Court of Florida. He is also a member of the Martin County Bar Association and St. Lucie County Bar Association. Outside of practicing law, Casey enjoys spending time with his family, attending Church, traveling, and cheering on his Seminoles!

Florida State University in Tallahassee
University of Western Michigan Thomas Cooley Law School

Bar Memberships

  • University of Western Michigan Thomas Cooley Law School
  • Active Bar License/ Certifications State of Florida, Issued April 2013
  • United States District Court for the Southern District of Florida
  • United States District Court for the Middle District of Florida
  • United States District Court for the Northern District of Florida
  • Eleventh Circuit Court of Appeals

Mr. Williams Volunteer as a youth soccer coach for ages 11-12; Habitat for Humanity; Toys for Tots and the Martin County Humane Society Mutt March.

Professional Associations – Martin County Bar Association & St. Lucie County Bar Association.

Mr. Williams is dedicated to helping all of his clients win their legal battles. If you are in need of help or have been hurt in an accident, give Casey a call today. Let his experience and knowledge guide you.

Get the Legal Representation You Need

At The Law Firm of Cushnie & McMahon, our entire team is dedicated to helping you receive the justice and money compensation you deserve. Whether you are recovering from a serious accident or are going through a divorce, our attorneys and support team provide compassionate, committed services.

For more information or to schedule a free consultation for your personal injury case, contact our law firm in Port St. Lucie, FL today. Personal Injury consults are always FREE and we feature a “No Recovery – No Fee or Costs” policy. Appointment times are flexible and if you can’t make it to the office, we will come to you. We are determined to help you receive the results you deserve.

A Word From Our Clients

    5 star review  One of the best thing that i like about the Law Firm of Cushnie & McMahon is you get to see and talk to your lawyer anytime you want to about your case. Their professionalism is incomparable. For the past 15 years, my family and friends are always been happy with law firm. In addition, if you need a good law firm to handle your case so you can get a nice smile at the end dont hesitate to hire Cushnie & McMahon.

    thumb ALAN EDMOND

    5 star review  I was most fortunate to have been referred to the law firm of Cushnie & McMahon in Port St. Lucie, Fl. after I was involved in an auto accident, when an 18 wheeler changed lanes without looking and rammed into me. Never in my life had I sued anyone and I did not have any idea of what to expect. From my first consultation up to the closing of my case, I was left with the highest of respect for this law firm. They are of the up-most professionals (and that includes all staff members), caring, compassionate and extremely understanding. I was made to feel as if mine was the only case they were handling due to the time they take to explain detail by detail of what one cans expect. I know my case was not "huge" but they treat all cases the same...with empathy to their client and a true interest for one's well-being. I cannot say enough of Cushnie & McMahon and at times "Thank You" is not enough. I recommend this law firm very highly & if my words can hep someone needing an attorney...I hope this has helped, as I have written with sincerity and true appreciation!

    thumb Lily Sanford

    5 star review  Great lawyer! Honest, trustworthy. Took my case after another lawyer dropped me and said I did not have a case. Mr. Cushnie went above and beyond my expectations. Already recommended him to a friend. He is an A++ lawyer.

    thumb Neil Laporte

Our law office in Port St. Lucie specializes in personal injury law, medical malpractice, accident law, and product liability law.

For more information about our services, or to schedule a confidential consultation, please contact us at 772-335-9219 today. Our office is located at 543 NW Lake Whitney Place, Suite 106 Port St. Lucie, FL 34986. We look forward to hearing from you.

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