John R. KoskoAssistant Prosecuting AttorneyCuyahoga CountyRegion 5 Supervisor(CPD-5th District, East Cleveland, Euclid, Cleveland Hts.)Office: 216-443-6956Cell: 216-544-3970John Kosko has been with the Cuyahoga County Prosecutor’s Office since starting as a law clerk for John T. Corrigan on June 18, 1979. He spent 2 years as a Law Clerk, 5 years as an Assistant Prosecutor in the General Felony Unit; 23 years in the Major Trial Unit; and has been Supervisor of Region 5 since February, 2012. He has tried over 300 jury trials, from Grand Theft-Auto to Aggravated Murder, and everything in between. He has tried cases against nearly every criminal defense attorney in Cuyahoga County. In 2006 he received “The Meritorious Service Award” from the Ohio Prosecuting Attorney’s Association and “The Carmen Marino Award” as outstanding assistant prosecutor of the year. In 2020 he was awarded the Franklin A. Polk Public Servant Merit Award by the Cuyahoga Metropolitan Bar Association.In addition to John T. Corrigan, he has worked under Stephanie Tubbs Jones; Bill Mason; Tim McGinty & Mike O’Malley