Johnny attended John Jay College School of Criminal Justice until he was recruited by the NYPD on August 30, 1993 for his work as an undergraduate. In March 1994 Johnny graduated from the New York Police Academy in the top 10% of his class foreshadowing his future success as a New York Police officer. In March 2003, Johnny was promoted to the rank of sergeant, the rank which he retained until he retired from the force in February 2009. During his tenure as a police officer, which included the height of the crack epidemic in the 1990s, Johnny made and assisted in more than 1,000 arrests. Throughout his career as a public servant for the City of New York, Johnny was assigned to various commands. He worked out of the 13th Precinct from 1994 through 2003, as a supervisor at the 33rd Precinct in Washington Heights from 2003–2004; he was subsequently assigned to Manhattan North Grand Larceny as Supervisor from 2004–2007 and later a supervisor in Astoria, Queens at the 114th Precinct. During his tenure on the force, Marines was awarded 12 Excellent Police Duty medals as well as 4 Meritorious Police Duty medals for 4 separate Bribery arrests.
Johnny was received as a guest speaker for young Latinos at Harvard’s prestigious Latino Leadership Initiative, where he interacted with rising Latino leaders from all over the country and spoke about the importance of perseverance especially when adversity hits. Johnny spoke at Harvard in 2011, 2012, and 2013. Johnny has also been received as a guest speaker at Columbia University, Lehman College, and in September 2012 at Syracuse University. In 2012 Marines was interviewed to be a part of the "Famosos" section of About.com's celebrity section. Johnny was a keynote panelist at the 8th annual National Dominican Student Conference at Harvard University in April 2014. On May 5, 2014 Johnny sat on a panel of judges for the Annual Congressional Art Competition in New York for high school student artists. On December 23, 2014, Johnny Marines was accompanied by all-star New York Yankees pitcher, Dellin Betances, for Johnny's annual toy giveaway in New York City. Johnny was named a "Top Latin Player" by Billboard in August 2015 for his continued success in managing Romeo Santos