Question: Robert William Kozaren served as mayor of which city?

<P0-S0> Bobby G. Peters (born February 21, 1949) is a Superior Court Judge in Columbus, Georgia. <P0-S1>  He is also the former Mayor of Columbus. <P0-S2>  He was first elected Mayor in 1994, after twelve years as a city councilor. <P0-S3>  In 1998, Peters became the first Columbus mayor to win re-election to a second term since consolidation. <P0-S4>  He In a field of six candidates, including the a black minister and the President of the N.A.A.C.P., he won without a run off and won every black precinct in the city which demonstrated his appeal to a cross section of the community. <P0-S5>  He served as Mayor for 8 years, until 200s when Robert Poydasheff was elected. <P0-S6>  As Mayor, Peters also served as Public Safety Director of the city in charge of the Police Department, Fire Department, EMS, E-9ll, Muscogee County Prison, and all non-public safety departments. <P0-S7>  His success was hiring the best, including a three star General who was commander of Fort Benning, Georgia. <P0-S8>  Gen. Carmen Cavezza was requested by Peters to be his City Manager and he accepted. <P0-S9>  They had one of the best relationships in the history of the city as evidenced by 8 great years without a tax increase and over a billion dollars of new investment in the city. <SEP> <P1-S0> Hamtramck ( ) is a city in Wayne County of the U.S. state of Michigan. <P1-S1>  As of the 2010 census, the city population was 22,423. <P1-S2>  Hamtramck is surrounded by the city of Detroit except for a small portion of the western border that touches the similarly surrounded city of Highland Park. <SEP> <P2-S0>  He served as Mayor of the City of Hamtramck, Michigan from 1980 to 1997. <P2-S1> Robert William Kozaren (June 5, 1934 – 2007), born in Detroit, Michigan, was an American of Polish descent, and a Democratic politician. <P2-S2>  Elected to nine terms, was Hamtramck's longest serving mayor. <SEP> <P3-S0> Thomas P. Ryan Jr. (December 3, 1928 – March 14, 2003) was the 63rd Mayor of Rochester, New York. <P3-S1>  Ryan began his tenure as Mayor under the old council/city manager system of government, in which the mayor was selected from among members of City Council to be that body's presiding officer. <P3-S2>  He first was voted to the post by his Council peers after the 1973 election which returned a Democratic majority to office. <P3-S3>  For his first decade as Mayor, a city manager appointed by City Council and accountable to that body handled the day to day administrative duties of government. <P3-S4>  This system had been in place since the late 1920s as a result of government reforms championed by the late industrial magnate George Eastman. <P3-S5>  However Ryan, who had exercised greater de facto influence over city policy than most of his predecessors under this system and functioned in many respects like a chief executive in policy matters, championed a change in the city charter to abolish the post of city manager and return to a "strong mayor" system like that in other major cities of New York State, in which the mayor was directly elected, directly accountable to voters and served as chief executive of city government. <P3-S6>  The charter change was approved by city voters and Ryan served as a "strong mayor" for two terms from 1985 through 1993 before retiring from public life. <P3-S7>  In addition to the revision in city government structure which began during his terms of office and continues in force today, Ryan became known for helping lead significant downtown redevelopment, and operating government on a fiscally conservative basis.