Determining the "most successful" lawyer can be subjective, as success can be measured in various ways such as influence, financial wealth, or legal victories. However, several lawyers stand out for their extraordinary achievements and influence in the legal world.

David Boies is often regarded as one of the most successful lawyers in the U.S. He is known for his role in high-profile cases such as representing Al Gore in the Bush v. Gore case and challenging California's Proposition 8, which banned same-sex marriage​ (Above the Law)​.

Another highly successful lawyer is Ted Olson, who partnered with Boies in the Proposition 8 case. Olson has a long history of significant legal work, including serving as Solicitor General of the United States and representing George W. Bush in Bush v. Gore​ (Above the Law)​.

In terms of financial success, Charlie Munger, although now more famous as Warren Buffett's business partner, started his career as a lawyer. Munger founded the law firm Munger, Tolles & Olson LLP before transitioning fully into investment, amassing a net worth of approximately $2.5 billion​ (Lawyer Monthly)​.

Additionally, Judith Sheindlin, popularly known as Judge Judy, transitioned from a family court prosecutor to a television personality, earning a significant fortune estimated at $440 million through her long-running TV show​ (Lawyer Monthly)​.

These examples highlight different dimensions of success in the legal profession, from high-profile case victories and legal influence to significant financial achievements.