Question: Who was the acting mayor of Detroit when Hazen S. Pingree resigned from office in 1897?

full_context: Document 1: Hazen S. Pingree: Hazen Stuart Pingree (August 30, 1840 – June 18, 1901) was a four-term Republican mayor of Detroit (1889–1897) and the 24th Governor of the U.S. State of Michigan (1897–1901). A Yankee who migrated from New England, he was a Georgist social reformer who battled corporations and was an early leader of the Progressive Movement.
Document 2: Governor of Michigan: The Governor of Michigan is the chief executive of the U.S. state of Michigan. The current governor is Rick Snyder, a member of the Republican Party, who was inaugurated on January 1, 2011, as the state's 48th governor, was re-elected November 4, 2014, and was sworn in for a second term on January 1, 2015. He is not eligible for a third term under Michigan's term limits, which limit a governor to two, four-year terms.
Document 3: Rick Snyder: Richard Dale Snyder (born August 19, 1958) is an American politician, business executive, venture capitalist, and accountant who is the 48th and current Governor of Michigan. A member of the Republican Party, he assumed office as governor on January 1, 2011. From 2005 to 2007, Snyder served as the chairman of the board of Gateway, Inc., based in Irvine, California. Prior to his election as governor, he was chairman of the board, chief executive officer, and co-founder of Ardesta LLC, a venture capital firm based out of Ann Arbor, Michigan.
Document 4: William B. Hartsfield: William Berry Hartsfield, Sr. (March 1, 1890 – February 22, 1971), was an American politician who served as the 49th and 51st Mayor of Atlanta, Georgia. His tenure extended from 1937 to 1941 and again from 1942 to 1962, making him the longest-serving mayor of his native Atlanta, Georgia.
Document 5: Samuel Wescott: Samuel Wescott was the tenth Mayor of Jersey City. He succeeded David Stout Manners. Wescott served a single term from May 4, 1857 to May 2, 1858. He was succeeded by Dudley S. Gregory. Wescott served in the New Jersey State Senate from 1860 to 1862.
Document 6: David Hollister: David Hollister (born April 3, 1942) served as the mayor of Lansing, Michigan from 1993 to 2003, until he resigned to be the director of the Michigan Department of Labor and Economic Growth under Michigan Governor Jennifer Granholm's administration. During his tenure as mayor, he was instrumental in convincing General Motors Corporation to build the Grand River Assembly Plant downtown, and to build a new plant in the region to replace the Lansing Car Assembly Plant which dated back to 1903. Also under his tenure came the completion of Cooley Law School Stadium, the stadium for the Lansing Lugnuts, a Class A minor league baseball team. Mayor Hollister made central city (including downtown and Old Town) revitalization a top priority of his administration. Hollister was born In Kalamazoo and raised in Battle Creek, Michigan, where he graduated from Battle Creek Central High School. He earned bachelor's and master's degrees from Michigan State University. From 1967 to 1970 he was a social studies teacher at Lansing Eastern High School. Prior to becoming mayor, he served in the Michigan House of Representatives from 1973-1993 representing the City of Lansing. In 2005 he was recruited to run Prima Civitas, an economic development organization funded by Michigan State University and the city governments of Lansing and East Lansing, Michigan.
Document 7: William S. Maynard: William Sumner Maynard (April 25, 1802 – June 18, 1866) was a politician from the U.S. state of Michigan, who served as mayor of Ann Arbor, Michigan from 1856 to 1858 and again from 1865 to 1866. Maynard was born in Berkshire County, Massachusetts. He suffered from severe depression and (while still Mayor) committed suicide in 1866 by an overdose of (laudanum) morphine. Long notes of explanation were found in the pockets of his dressing gown, detailing Maynard's struggles with "The Evil One" (a synonym for Satan). The notes were published verbatim in Ann Arbor's several weekly newspapers. Maynard had been Ann Arbor's biggest land developer, a member and organizer in 1836 of the Ann Arbor Land Company, which acquired the former Henry Rumsey farm east of town, conveying 40 acres thereof to the newly formed State of Michigan as the site of the future University of Michigan, while hoping to profit by subdividing and selling town lots adjacent to the campus. Maynard also developed much of the land west of Ann Arbor's Main Street, as far west as the present Seventh Street. His own landmark dwelling was on the northwest corner of Main and William Street, and the estate stretched west to the present Ashley street, and halfway up the block to Liberty. For many years he owned a grocery, drug and dry-goods store and was said to be the wealthiest man in Ann Arbor at the time of his suicide. His grave is in Forest Hill Cemetery in Ann Arbor.
Document 8: Horace Mann: Horace Mann (May 4, 1796August 2, 1859) was an American educational reformer and Whig politician dedicated to promoting public education. He served in the Massachusetts State legislature (1827–1837). In 1848, after public service as Secretary of the Massachusetts State Board of Education, Mann was elected to the United States House of Representatives (1848–1853). About Mann’s intellectual progressivism, the historian Ellwood P. Cubberley said:
Document 9: William Richert (mayor): William Richert (October 28, 1858 – June 16, 1912) served as acting mayor of Detroit, Michigan from March 22, 1897 to April 5, 1897, following the resignation of Hazen S. Pingree.
Document 10: George W. Romney: George Wilcken Romney (July 8, 1907 – July 26, 1995) was an American businessman, author, and Republican Party politician. He was chairman and president of American Motors Corporation from 1954 to 1962, the 43rd Governor of Michigan from 1963 to 1969, and the United States Secretary of Housing and Urban Development from 1969 to 1973. He was the father of former Governor of Massachusetts and 2012 Republican presidential nominee Mitt Romney and the husband of former U.S. Senate candidate Lenore Romney.
Document 11: Tom McMillin: Tom McMillin is a member of the Michigan State Board of Education, and a former member of the Michigan State House from 2009 through 2014, representing the 45th State House district centered in Rochester Hills, Michigan. He was previously mayor of Auburn Hills and a member of the Oakland County Commission. McMillin graduated from the University of Michigan in 1987 with a bachelor's degree in economics and accounting. He is a certified public accountant.
Document 12: Jerome Cavanagh: Jerome Patrick Cavanagh (June 16, 1928 – November 27, 1979) was the mayor of Detroit, Michigan from 1962 to 1970. Initially seen as another John F. Kennedy, his reputation was doomed by the 1967 riots. He was the first mayor to reside at Manoogian Mansion, donated to the city by the industrial baron Alex Manoogian.
Document 13: Stevens T. Mason: Stevens Thomson Mason (October 27, 1811January 4, 1843) was an American politician who served as the 1st Governor of Michigan from 1835 to 1840. Coming to political prominence at an early age, Mason was appointed his state's acting Territorial Secretary by Andrew Jackson at 19, becoming the acting territorial governor soon thereafter in 1834 at 22. As territorial governor, Mason was instrumental in guiding Michigan to statehood, which was secured in 1837. A member of the Democratic Party, he was elected as Michigan's first state governor in 1835, where he would serve until 1840. Elected at 23 and taking office at 24, Mason was and remains the youngest state governor in American history.
Document 14: Wilson Frost: Wilson Frost (born December 27, 1925) is a former Chicago alderman of the 34th Ward. In 1976, upon the death of longtime mayor Richard J. Daley, Frost declared that he was now acting mayor, based upon his interpretation of the city charter and the fact that he was serving as President Pro Tempore of the City Council. However, Wilson found himself literally locked out of the mayor's office—he was told that the keys could not be found. In a power struggle that lasted several days, the entirely Democratic city council determined that Frost was incorrect in his claim, and appointed Alderman Michael Bilandic as acting mayor instead. Had he been elected mayor, Wilson Frost would have been Chicago's first African American mayor.
Document 15: William H. Wickham: William Hull Wickham (July 30, 1832 – January 13, 1893) was the 81st Mayor of New York City and anti-Ring Democrat who helped to topple corrupt politician Boss Tweed.
ground_truth: William Richert