Morihei Ueshiba is the founder of Martial Arts and is a legend in martial arts but he passed away in 1969.

Steven Seagal in his debut movie 'Above the Law' brought some exposure of Aikido itself and also in film. He went on to make series of movies where he beats up countless bad guys using Aikido techniques.

Some have argued that the techniques used by Steven Seagal is not really Aikido. Aikido is a very passive martial arts, using the energy of the attacker and redirect them. If you see the fight scenes of Seagal movies, he's a bit more on the aggressive side.