No.Did Albert Einstein steal the work on relativity from his wife? originally appeared on Quora: the knowledge sharing network where compelling questions are answered by people with unique insights.
It is an extraordinary claim, and as such, requires evidence. Einstein scholars (notably John Stachel and Robert Schulmann) have spent a lot of time and effort clarifying the sources of the allegation which as far as I can see, boils down to two claims:
1. That Abram Fedorovich Joffe, a member of the Soviet academy of Sciences and an assistant to Röntgen from 1902 until 1906, saw the original manuscript of the relativity paper, Zur Elektrodynamik bewegter Korper, and that this manuscript was signed "Einstein-Marity." And "Marity" is a Hungarian variant of the Serbian "Marić," Mileva’s maiden name. So, the claim goes, Mileva Marić Einstein’s name was on the original manuscript, but was then left out of the published article, where Albert Einstein’s name appears alone.
2. That on March 27, 1901 Einstein wrote a letter to Marić that included the clause "... bringing our work on relative motion to a successful conclusion." Note the "our," which implies that the work was done in collaboration.
More doctoral-level blah-blah at link.