Who is Mark Davis?

Biography from Wikipedia of Mark Davis, hosting Rush Limbaugh show on Friday:

Mark Davis is an American radio host, newspaper columnist, and political commentator. His local talk show, The Mark Davis Show, airs on weekdays from 8:30 AM to 11 AM on WBAP in the Dallas Fort Worth Metroplex, and his popular column is published in The Dallas Morning News. In March 2008, Davis joined the rotation of guest hosts for The Rush Limbaugh Show.

Davis describes himself as a libertarian conservative, opposing smoking bans, religious indoctrination in public education, and illegal immigration. However, he also supports the War on Terror and stops short of embracing drug legalization.

Born in San Antonio, Texas in 1957 and raised in the Maryland suburbs of Washington, DC, Davis graduated from the University of Maryland in 1979 with a Bachelor of Science in Journalism.

Program history
Davis started as a news anchor and reporter at WKAZ/WQBE in Charleston, West Virginia from 1979 to 1981. From there, he went to WOKV in Jacksonville, Florida, serving again as a news anchor until launching a talk show in 1982. From there he went to WHBQ in Memphis, Tennessee beginning in 1985, WMC in Memphis in 1989, WTKN in Tampa, Florida briefly in 1990, WWRC in Washington, DC 1990-94, and finally WBAP in Dallas-Ft. Worth, Texas in 1994, where he remains to this day.

The Mark Davis Show airs from 8:30 to 11:00 AM CT.

Davis has been heard in national syndication with two shows, a Sunday three-hour broadcast from 1998-2003 and a two-hour weekday show which followed his local program from 2005-2007. The latter was produced mainly for ABC's satellite talk radio channel.

On July 3, 2008, his show was simulcast on C-SPAN 2. [1] During the commercial breaks he addressed the camera and provided some behind-the-scenes insights on talk radio and the issues of the day.