Mr. Greenfield has been aggressively fighting for the constitutional rights of his clients since 2001, practicing with great passion and courtroom skill, Mr. Greenfield litigates some of the most high profile and complex cases in the country, specializing in the cross examination of adverse witnesses, expert witnesses, and professional government witnesses.Mr. Greenfield's professional resume is well documented covering both Federal and State matters involving Personal Injury, Wrongful Death, Civil Rights Violations, Defamation, Racketeer Influenced and Corrupt Organizations ("RICO"), Federal Narcotics Matters, Federal Drug Trafficking and Conspiracy, Theft Crimes, Tax Evasion, Government Contracting Fraud, White Collar Crimes, Weapons Charges, CFTC and SEC Matters, and many more.Mr. Greenfield has tried cases against defense counsel of all levels both in the civil and criminal courts throughout the United States, including but not limited to United States attorneys, district attorneys, attorneys general, and has confronted in litigation the FBI, DEA, ATF, OCIDEF Task Force cases, government contracting fraud, all levels of state law enforcement personnel, and many others.Mr. Greenfield has been admitted to practice by the Supreme Court of the State of California, the United States District Court for the Central, Northern, Eastern, and Southern Districts of California, the United States District Court for the District of Colorado, and pro hac vice for intensive litigation matters in State of South Dakota, United States District Court for the Western District of South Dakota, District of Alaska, Southern District of New York, District of Nevada, Northern District of Illinois, Northern District of Texas, Eastern District of Texas, District of Arizona, and the District of New Hampshire.Mr. Greenfield's professional experience has also involved representation of professional athletes in the NFL, CFL, and NBA.