Reinberg had a very successful career as a florist.[5][6] He had begun by growing turnips and potatoes, before experimenting with roses and flowers in 1890.[9] He was very successful at growing roses and carnations, and eventually owned greenhouses with 1,200,000 square feet (110,000 square meters) of glass.[7] He was among the most famous greenhouse owners in Chicago.[7] He was considered the "Rose King" of Chicago.[7] His business made him a millionaire, and he was among the largest rose growers in the world.[7] He was also considered to be the largest grower of carnations in the United States.[10]
Reinberg would serve on the board of directors of Ravenswood Bank.[6]
Chicago City Council
In 1904, Reinberg made his political debut by successfully running as the Democratic nominee for Chicago City Council in the 26th district.[10][4] In his campaign, he used the unique gimmick of providing each resident of his ward with carnations to wear.[9][10]
Reinberg was reelected in 1906,[11] 1908,[12] and 1910.[13] Reinberg was unseated in 1912 by Republican nominee George Pretzel.[14]
In years such as 1908 and 1910, he had received election endorsements from the Municipal Voters League.[12][15]
President of the Cook County Board of Commissioners
In 1914, he was elected president of the Cook County Board of Commissioners. Having been nominated by the Democratic Party, he defeated Progressive Parryincumbent Alexander A. McCormick. There was no Republican nominee (Republicans had been blocked by the Illinois Supreme Court from an electoral fusion joint nomination of McCormick).[18] Reinberg led McCormick (the county's leading Progressive Party politician) by more than a 60,000 plurality in the November election. The Democratic Party swept the 1914 Cook County elections. However, unlike
in Reinberg's race, for the other countywide offices, Democratic nominees had only won by mere hundreds of votes.[19]
Reinberg was sworn in as president on December 7, 1914.[20] He would hold the county board presidency until his death in office in 1921.[1][5] He was reelected in November 1918, defeating Republican Charles N. Goodlow by a much narrower margin than his victory four years prior.[21]
During Reinberg's tenure, the county was hit by the 1918 Spanish flu epidemic. Amid this, he ordered the Cook County Hospital closed to all visitors, except those visiting individuals dying from diseases other than the flu.[22]
Reinberg was also, by virtue of this position as county board president, the first president of the newly created Forest Preserve District of Cook County.[5] He oversaw its acquisition of more than 18,000 acres of land.[5] He is sometimes considered the "father" of Cook County's forest preserve system.[7]
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