It was Tom Baker; he played the Doctor for seven years.
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Peter Capaldi (the Twelfth Doctor) has been playing the Doctor since 2013, when he took over from Matt Smith.
Christopher Eccleston is 9th doctor in 2005.
An English actor. Among other things, he played the Ninth Doctor in the popular series "Doctor Who".
Yes Robert Hardy had a brother who was a doctor although he has now passed away.
In my opinion Patrick Troughton is .... would disagree! David Tennant is the most popular actor to play Dr Who. Others may come and go but he IS the Doctor - then, now and always!