Positions at network O&Os are frequently sought after by those who wish to eventually work for a television network. Indeed, many O&Os have served as a stepping stone for television personalities at their parent networks. For example, former "Today" and "NBC Nightly News" presenter Tom Brokaw used to work for NBC's Los Angeles O&O, KNBC, before moving to the network while Matt Lauer and Al Roker worked for NBC's flagship O&O in New York City, WNBC-TV, before becoming hosts on "Today". Additionally, Roker had begun his career with NBC at former O&O WKYC-TV in Cleveland, known as a "farm station" which developed talent for the larger O&O stations and network (although, until after it ended following Multimedia's purchase of controlling interest in the station in 1990, this strategy left WKYC as a longtime also-ran in the Cleveland market due to heavy staff turnover). Roker's predecessor as the "Today" show's weatherman, Willard Scott, was an on-air personality at WRC-TV, NBC's O&O in Washington, D. C., before going to New York in 1980. Another example is BBC London News presenter Emily Maitlis, who joined BBC News 24 and BBC Two's Newsnight in 2006. Although working at an O&O does not guarantee a network job down the line, the on-air presenter or correspondent does potentially receive additional exposure to the network and often a larger audience given that O&Os are often found in the largest media markets. personnel at an O&O station may also be promoted to a higher network-level position. Emmy Award-winning videotape editor Walter Balderson, for example, began his career in television as an engineer at WRC-TV in Washington before eventually becoming NBC's videotape editor for "The Huntley–Brinkley Report", as well as other NBC network shows in New York.