Often compared to
Rex Harrison, Mulhare had his two greatest US
successes inheriting roles that Harrison created. On Broadway, Mulhare
succeeded Harrison as Henry Higgins in "My Fair Lady" when the latter
joined the London company, playing the part for most of the play's
remaining Broadway run. On television, Mulhare played the role of the
ghost of Captain Daniel Gregg in the TV version of "The Ghost and Mrs.
Muir", a role Harrison had created two decades earlier in the film
version.