Las Vegas immigration and criminal defense attorney Alexander Vail brings to Las Vegas Defense Group invaluable insight from behind enemy lines: During his prior clerkship with the Clark County District Attorney's Office's Appeals Unit, he learned firsthand how the state builds cases against defendants. Now Alexander uses this insider information to craft a proactive defense and stay one step ahead of the D.A. An Army ROTC Distinguished Military Graduate, Alexander earned magna cum laude honors from the University of Miami School of Law. There he earned placement in Order of the Coif, served as student attorney at removal proceedings in the Immigration Clinic, and was first in his class several times, including in immigration law. Following prestigious externships with the Broward County Public Defender's Office and an Eleventh Court of Appeals judge, Alexander was selected as an attorney advisor for the Office of the Chief Immigration Judge, Executive Office for Immigration Review, of the U.S. Department of Justice. Alexander has extensive experience in all stages of criminal and immigration cases, at both the trial and appellate levels. He is a tireless researcher and writer as well as a skilled negotiator and litigator. Las Vegas Defense Group is proud to have Alexander as part of its team. He brings an insatiable passion for safeguarding the rights and championing the cause of his immigration and criminal defense clients. Alexander is also licensed to practice law in Florida

David C. O’Mara’s practice is concentrated in appellate advocacy, bankruptcy, family law, personal injury, civil litigation, and securities and shareholder disputes. As a native Nevadan, with over a decade of experience practicing in the state, David has developed a comprehensive understanding of the nuances of Nevada law and practice. David has been involved in numerous securities and shareholder actions which have resulted in the recovery of millions of dollars to the shareholders. In addition, David has successfully represented his clients at all state and federal courts in Nevada, including bench trials, jury trials and appellate arguments in the Nevada Supreme Court.

Jeremy Mondejar is a practicing lawyer in the state of Nevada handling Criminal Defense matters.

We are a small and highly focused law firm operating in Clark County Nevada. Our Managing Attorney, Tim Treffinger is a former prosecutor with the Storey County District Attorney's Office, and the Nevada Attorney General's Office. Mr. Treffinger prides himself on working with individuals to meet their legal needs at a reasonable fee, with payment plans available depending on qualification, and works to provide options for those who seek representation. In 2022 Mr. Treffinger was the Republican Nominee for Clark County District Attorney receiving votes from both Democrats and Independents (along with his Republican party votes), and totaling nearly 300,000 votes in support of his campaign.

John C. Courtney, Esq. is an A-V Rated® Attorney, recognized locally by Nevada Business Magazine® (Legal Elite 2014, 2016) and Super Lawyers® (Mountain States Rising Star 2015-2018). As a Barrister, John recently served as the March 2016 Presentation Chairman for the Howard D. McKibben American Inn of Court. John has a proven track record of founding successful enterprises in Nevada. When John was the founding president of the Kappa Alpha Chapter (UNLV) of Kappa Sigma Fraternity, it became the largest fraternity on UNLV’s campus. John was also the founding president of the Weiner Chapter of the Phi Alpha Delta Law Fraternity, International (P.A.D.). Under John’s leadership, the William S. Boyd School of Law (UNLV) chapter of P.A.D. became the largest private student organization in the history of the law school. While committing a considerable amount of time to organizations aimed to advance service, fellowship, leadership, and scholarship, John has continuously dedicated his time to attain the most from his formal and informal educational endeavors, and he could have never made it all happen without the support of his wife and best friend, Angela Vanzant Courtney, whom he first met nearly 30 years ago when John was an aspiring roofer.

Anthony P. Sgro is a partner and founding member of Sgro & Roger, LLC. After attending the University of San Diego for both his undergraduate education and law school, Mr. Sgro returned to Las Vegas and began practicing primarily in the area of criminal defense. In short order, he became a “death qualified” attorney and focused on defending those charged with capital murder offenses. ​ After trying numerous cases, Mr. Sgro used his unique trial experience to branch out into other areas of law, including personal injury, entertainment, and business law. Remarkably, he found his trial skill set transferred to those areas as well. Since the beginning of his career, Mr. Sgro has tried over 125 jury trials in both the civil and criminal arena. Most notably, as trial counsel, Mr. Sgro secured numerous acquittals in criminal cases including acquittals in extortion cases, drug cases, sexual assault cases and murder cases. He has been awarded millions of dollars by way of jury verdicts in medical malpractice cases and in personal injury cases. He also secured the largest slip and fall personal injury verdict to be awarded against Walgreens corporation, as well as a real estate trial verdict in excess of $55 million. Notably, that same trial experience allowed him to resolve the largest settlement for a single plaintiff personal injury case in Nevada history, which exceeded $30 million. ​ Several years ago, Mr. Sgro once again expanded his practice and business interests. He had the privilege of representing, and routing Prince’s 2013 West Coast tour, which spanned 13 U.S. cities. Most recently, his legal experience has allowed him to participate in the gaming arena, including both local and overseas gaming operations. ​ Years ago, Mr. Sgro teamed up with long time friend David Roger to create the firm that exists today. Mr. Roger is the former District Attorney for all of Clark County, Nevada, and he served in that capacity for approximately 25 years.

Zachary focused his law school experience on criminal law, externing with a local public defender’s office, the United States Attorney’s Office for the District of Nevada, and multiple criminal defense firms. Zachary also served in the law school’s criminal defense appellate clinic, where his brief on behalf of an indigent client earned the law school’s award for excellence. After law school, Zachary relocated to Tampa, Florida where he began his career with the Hillsborough County Public Defender’s Office before moving to a highly regarded criminal defense firm in the Tampa area. He has defended individuals accused of a broad range of offenses, including DUI, battery, drug and weapons possession, sex crimes, and homicide. Zachary returned to Las Vegas in 2020. Prior to joining Sgro and Roger, he served as a judicial law clerk for the Honorable Ellie Roohani in the Eighth Judicial District Court, managing a split docket of criminal and civil cases. Outside of the office, Zachary enjoys traveling, playing poker, and providing long-distance support for his University of Connecticut basketball teams.

Danielle is an associate attorney at Sgro & Roger, representing clients in a range of personal injury, criminal, and family law matters. She is devoted to helping her clients obtain the most favorable outcome in the resolution of their cases. Danielle joins the firm after completing a judicial clerkship with the Honorable Eric Johnson in Department XX of the Eighth Judicial District Court. During her term, she assisted the Court render decisions in various civil and criminal matters. She also gained invaluable trial experience working on medical malpractice, wrongful death, catastrophic injury, and felony cases.