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Mackintosh's journalism career began at the Philadelphia Evening Bulletin, where he worked as copy supervisor in the editorial department from 1964 to 1968. Following that, he moved to the Virgin Islands in 1969 to work for The Virgin Islands Daily News as a reporter.
He joined CBS 3 in Philadelphia in September, 1970 following three years as a news writer for sister station KYW Newsradio.
He won a Philadelphia Emmy Award in 1986 for feature reporting; a Pennsylvania Associated Press Broadcasters Association Award for spot news and, in 1983, a special honor presented by President Ronald Reagan at the White House for a series on volunteerism.
In December 2006, Mackintosh became the longest serving street reporter in Philadelphia after the retirement of NBC 10's Bill Baldini. On Wednesday, July 30, 2008, Robin Mackintosh gave his last on-air report from Love Park in Philadelphia; he celebrated his 40th anniversary on TV that day.
He is a 1971 graduate of Temple University, with a degree in English/Communications. He and his wife Barbara have three grown children and reside in Montgomery County.
The Broadcast Pioneers of Philadelphia  inducted Mackintosh into their Hall of Fame in 2012.
- (3 October 1986). TV reporter to talk at dinner community newsline, The Morning Call, Retrieved November 23, 2010
- (29 July 2008). Mendte's eligible for Emmys, Philadelphia Daily News, Retrieved November 23, 2010 ("CBS 3 reporter Robin Mackintosh will retire from the station tomorrow after 40 years in Philadelphia broadcasting. Mackintosh joined Channel 3 in 1970")