Biographical Evidence.
Because he worked with formulas which contained mathematical elements, the assumption is that Albert Einstein was an accomplished mathematician. However, biographical evidence is that he did not excel at higher levels of mathematical study, was frequently absent from lectures, and regularly given poor grades. His passion was for physics and he would employ the services of those more skilled in mathematics to check, edit and advise on his research papers before they were published. His second wife, who was also his cousin, served him well in this capacity.
Another Answer:
Albert Einstein was a theoretical physicist. He used mathematics, but he was not technically a mathematician.
He was both a scientist and a mathematician
Albert Einstein
He had autism.
Albert einstein
Albert Einstein
Albert Einstein Sir Issac Newton
He was an accomplished scientist
Einstein's accomplishements did not impact on mathematics in any significant way.
No idea. But I'd say Albert Einstein was
Albert Einstein
E=mc^2
Albert Einstein was a mathematician and philosopher but he also did physics.