Left hemisphere

If you study sitting up erect, you may be left lobe. The left hemisphere of the brain processes information from part to whole. In order to draw conclusions, it first takes pieces, lines them up and arranges them in logical order. When left-brain students read or listen, they look for pieces so that they can draw logical conclusions. They have no problem comprehending or expression oral or written language. The functions of the left hemisphere of the brain are verbal, rational, realistic, and rigid. Some problematic characteristics, which exist in the right hemisphere of the brain, are emotional comprehension and procession of symbols.
Left-brain students are verbal and have little trouble expressing themselves in words.

Albert Einstein
I think he used more the left hemisphere of the brain because he used more logical, realistic and rational information. It helped him on his career because he used it for his achievements as a theoretical physicist, philosopher and author who is widely regarded as one of the most influential and best known scientists and intellectuals of all time.

Stephen Hawking
I think he used more the left hemisphere of the brain because he had to use logical and rational conclusions in his career as a theoretical physicist and cosmologist, whose scientific career spans over forty years. Hawking was the Lucasian Professor of Mathematics at the University of Cambridge for thirty years. He is also a Fellow of Gonville and Caius College, Cambridge and a Distinguished Research Chair at the Perimeter Institute for Theoretical Physics in Waterloo, Ontario. He is known for his contributions to the fields of cosmology and quantum gravity, especially in the context of black holes.

Right hemisphere

The right hemisphere processes information from whole to parts. Usually it sees the whole picture first before the details. If you are right brain, it may be difficult for you to follow a lecture without the professor had given the outline first. If that is the case, it may be best for you to read the chapter before class or ask the professor to give you the topic and outline of the next lecture. You may also have trouble writing outlines if you are right-brained. You would write the entire paper and then last, the outline (if required).
The right hemisphere is spatial orientated, recognizes sequencing of symbols, objects, and events, appreciates music, non-verbal, emotional, empathic, witty and humorous. Other functions consist of drive, order, planning, and executive control. Some problematic characteristics, which exist in the right hemisphere of the brain, are emotional comprehension and procession of symbols.
Right brain students know how they feel but have trouble expressing it in words.

George Harrison
I think he used the right side more because he was a successful musician and it helped him in his career because it influenced him developing his abilities on music such as playing guitar, singing, songwriting and as a film producer who achieved international fame as lead guitarist of The Beatles. Harrison is listed at number 21 in Rolling Stone magazine's list of "100 Greatest Guitarists of All Time".

Ludwig van Beethoven
I think he has more developed the right hemisphere because he had abilities on music; he was a great composer and pianist. He is considered to have been the most crucial figure in the transitional period between the Classical and Romantic eras in Western classical music, and remains one of the most famous and influential composers of all time.

Conclusion

I think that our dominant brain hemisphere or side doesnt tell who we are because both sides complement each other, but it influence our way of thinking and help us to develop certain abilities.