Answer by taking a quote from the following article:

Glenn Lee Beck (born February 10, 1964) is an American talk show host, political commentator, and producer. He is the CEO, founder, and owner of Mercury Radio Arts, the parent company of his television and radio network TheBlaze. A conservative, he hosts the Glenn Beck Radio Program, a popular talk-radio show nationally syndicated on Premiere Radio Networks. Beck also hosts the Glenn Beck television program, which ran from January 2006 to October 2008 on HLN, from January 2009 to June 2011 on the Fox News Channel and currently airs on TheBlaze.

In 1983 he moved to Corpus Christi, Texas, to work at radio station KZFM. In mid-1985, Beck was hired away from KZFM to be the lead DJ for the morning-drive radio broadcast by WRKA in Louisville, Kentucky. His four-hour weekday show was called Captain Beck and the A-Team. Beck had a reputation as a "young up-and-comer". The show was not political and included the usual off-color antics of the genre: juvenile jokes, pranks, and impersonations. The show slipped to third in the market and Beck left abruptly in 1987 amid a dispute with WRKA management.  Months later, Beck was hired by Phoenix Top-40 station KOY-FM, then known as Y-95. Beck was partnered with Arizona native Tim Hattrick to co-host a local "morning zoo" program. During his time at Y-95, Beck cultivated a rivalry with local pop radio station KZZP and that station's morning host Bruce Kelly. Through practical jokes and publicity stunts, Beck drew criticism from the staff at Y-95 when the rivalry culminated in Beck telephoning Kelly's wife on-the-air, mocking her recent miscarriage. In 1989, Beck resigned from Y-95 to accept a job in Houston at KRBE, known as Power 104. Beck was subsequently fired in 1990 due to poor ratings.  Beck then moved on to Baltimore, Maryland, and the city's leading Top-40 station, WBSB, known as B104. There, he partnered with Pat Gray, a morning DJ. During his tenure at B104, Beck was arrested and jailed for speeding in his DeLorean. According to a former associate, Beck was "completely out of it" when a station manager went to bail him out. When Gray, then Beck were fired, the two men spent six months in Baltimore, planning their next move. In early 1992, Beck and Gray both moved to WKCI-FM (KC101), a Top-40 radio station in New Haven, Connecticut. In 1995, WKCI apologized after Beck and Gray mocked a Chinese-American caller on air who felt offended by a comedy segment by playing a gong sound effect and having executive producer Alf Gagineau mock a Chinese accent. That incident led to protests by activist groups. When Gray left the show to move to Salt Lake City, Beck continued with co-host Vinnie Penn. At the end of 1998, Beck was informed that his contract would not be renewed at the end of 1999.  The Glenn Beck Program first aired in 2000 on WFLA (AM) in Tampa, and took their afternoon time slot from eighteenth to first place within a year. In January 2002, Premiere Radio Networks launched the show nationwide on 47 stations. The show then moved to Philadelphia, Pennsylvania, broadcasting from new flagship station WPHT. On November 5, 2007, The New York Times reported that Premiere Radio Networks was extending Beck's contract. By May 2008, it had reached over 280 terrestrial stations as well as XM Satellite. It was ranked 4th in the nation with over six and a half million listeners. As of July 2013, Beck was tied for number four in the ratings behind Rush Limbaugh, Sean Hannity, and Dave Ramsey.

What did this lead to
The show slipped to third in the market and Beck left abruptly in 1987 amid a dispute with WRKA management.