Title: What's My Line? (British game show)
Content:  What's My Line? is a panel game show based on the US version of the same name. It was originally aired on BBC Television Service from 16 July 1951 to 13 May 1963, hosted by Eamonn Andrews. It was revived by BBC2 from 23 August 1973 to 25 May 1974, hosted by David Jacobs, and then by ITV from 26 March 1984 to 31 August 1990. The ITV incarnation was first hosted by Eamonn Andrews from 1984 until his death in 1987, then by Penelope Keith for a part of 1988 before Angela Rippon took over until 1990. Two regional ITV stations, HTV and Meridian, revived it again from 19 September 1994 to 17 December 1996, when it was hosted by Emma Forbes. Regular panelists on the original version were Jerry Desmonde, Gilbert Harding, David Nixon, Barbara Kelly and Isobel Barnett.
Title: What's My Line?
Content:  In 1980, Mark Goodson-Bill Todman Productions, creators of What's My Line?, produced That's My Line which also highlighted the unusual occupations of ordinary people. However, the show was developed as a reality show and had no panel or game elements. What's My Line? announcer Johnny Olson was the announcer, and Bob Barker was the host for the show which ran for two seasons on CBS.
Title: What's My Line?
Content:  What's My Line? was a panel game show that originally ran in the United States on the CBS Television Network from 1950 to 1967, originally in black and white and later in color, with subsequent U.S. revivals. The game uses celebrity panelists to question contestants in order to determine their occupation, i.e. "line of work", with panelists being called on to question and identify a weekly celebrity "mystery guest" while blindfolded. It is on the list of longest-running U.S. primetime network television game-shows. Originally moderated by John Charles Daly and with regular panelists Dorothy Kilgallen, Arlene Francis, and Bennett Cerf, What's My Line? won three Emmy Awards for "Best Quiz or Audience Participation Show" in 1952, 1953, and 1958 and the Golden Globe Awards for 
Title: What's My Line?
Content:  Produced by Mark Goodson and Bill Todman for CBS, the show was initially called Occupation Unknown before deciding on the name What's My Line? The original series, which was usually broadcast live, debuted on Thursday, February 2, 1950, at 8:00 p.m. ET. After airing alternate Wednesdays, then alternate Thursdays, finally on October 1, 1950, it had settled into its weekly Sunday 10:30 p.m. ET slot where it would remain until the end of its network run on September 3, 1967. Starting in July 1959 and continuing for 8 straight years, until July 1967, the show would occasionally record episodes onto quadruplex videotape for playback at a future date. In July 1959, this was state-of-the-art technology. At 
Title: What's My Line?
Content:  a new, modern-design set. In 1971, production of What's My Line? moved from the Broadway studio to Studio 6-A at NBC in Rockefeller Center, and the series remained there for the rest of its run, with a set redesign in 1974 for the final season. As it had with the original series, Goodson-Todman went to ABC News to seek out a host, whose title had ceased to be that of "moderator," and hired Wally Bruner to take over for John Charles Daly. Bruner left the series at the conclusion of its fourth season in 1972, and Broadway actor Larry Blyden, who had already helmed several other games and served as a Line panelist and mystery guest in the past, stepped in at the beginning of the 1972–1973 season to host the remaining three seasons.
Title: 1951 in British television
Content: 16 July – What's My Line? debuts on the BBC Television Service. It will be one of the top-rated programmes for the rest of the decade and make a star of its host, Eamonn Andrews, who takes over from Gilbert Harding from the second episode. 
Title: Wally Bruner
Content:  In 1968, producer Mark Goodson approached Bruner to audition for the new syndicated version of What's My Line? Bruner’s background as an ABC News correspondent had been shared by the program’s original host, John Charles Daly. Part of Bruner's audition was an opportunity to view old kinescopes of the original CBS version. Bruner told Goodson that he did not need to do so, since one of his jobs in the 1950s had been to direct commercial breaks of the network feed of What's My Line? He claimed to have seen every episode that aired over a period of several years. Bruner hosted the show from CBS Studio 50, the Ed Sullivan Theater, from 1968 to 1972. Broadway actor Larry Blyden succeeded him for the program's final three seasons.
Title: What's My Line?
Content:  Unlike its predecessor, the syndicated What's My Line? did not emphasize formality as the panelists did not dress in formal wear. In addition, the panelists were simply referred to by name and only their first names were displayed in front of them. The show did manage to keep some elements of the original series intact, as the cartoon introduction used during the final two seasons on CBS was reused with new music added. The panelists also entered in the same manner as they had before with Soupy Sales (or the panelist occupying the seat farthest left when he was absent) coming out first and introducing the person sitting next to them, and continuing down the line to Arlene Francis (or whoever occupied her seat while she was absent), who would then introduce the host. That practice continued until the beginning of the final season in 1974, when announcer Chet Gould began introducing the panelists and host Blyden at once, in a conventional fashion.
Title: What's My Line?
Content:  What's My Line? was a guessing game in which the four panelists attempted to determine the occupation (i.e., "line [of work]") of a guest. In the case of the famous mystery guest each week, the panel sought to determine the identity of the celebrity. Panelists were required to probe by asking only yes-no questions. A typical episode featured two standard rounds (sometimes a third, and very rarely a rushed fourth) plus one mystery guest round. On the occasions on which there were two mystery guests, the first would usually appear as the first contestant.
Title: What's My Line?
Content:  The syndicated series ran for 1,320 episodes over seven seasons. An attempt at an eighth season did not get off the ground as not enough stations were willing to pick up the series for an additional year. With this in mind, Goodson-Todman offered host Blyden the hosting position on Showoffs, a charades-based game show that the company was developing for ABC's daytime lineup. He accepted and shot a pilot shortly after What's My Line? ended production. However, Blyden never got to host the series as he was killed in an automobile accident while traveling in Morocco just before taping was to begin. At the time of Blyden's death, a handful of new episodes of What's My Line? had yet to air in certain markets; by the fall of 1975, the last of these episodes had aired across the United States. Comedian Bobby Van ended up hosting Showoffs.

Question: who was the original host of what's my line?
Answer: John Daly.