One of the most intriguing evidence of Albert-Mileva Einstein scientific cooperation is the statement from Soviet physicist Abraham F. Joffe (1880-1960). He wrote in his "Remembrance of Albert Einstein" that he has seen the originals of the famous papers submitted in 1905 to the 'Annalen der Physik,' signed by the name "Einstein- Marity". Marity is a Hungarian version of a Serbian last name Marić. That would indicate Mileva as a coauthor of papers. In 1905 Joffe worked as an assistant to Wilhelm Roentgen who was one of the editors of 'Annalen der Physik' and therefore had a chance to see the submitted papers. Unfortunately, the originals disappeared.

Einstein himself occasionally made statements commenting on his lack of mathematical skills. For example, he confessed to Abraham Pais "I'm not a mathematician." On another occasion, he stated "Since the mathematicians have attacked the relativity theory, I myself no longer understand it anymore." This could be understood as a confirmation of Senta Troemel-Ploetz's claims in her article "Mileva Einstein Maric, the woman who did Einstein's mathematics," that Mileva contributed significantly to the mathematical portion of Einstein's work.

New Scientist article "Was the first Mrs Einstein a genius, too?" reporting from a conference held in New Orleans in 1990 by the Association for Advancement in Science, quotes John Stachel, professor of physics at Boston University, as saying that "Maric's role was that of a sounding board for Einstein's ideas." As a proof, he offers the fact that her marks were considerably worse than Einstein's in the final examination held at the Swiss Federal institute of Technology in Zurich, where they both studied. Senta Troemel-Ploetz responded to those claims by saying that Mileva was pregnant and unmarried at the time, which could have been a major problem for a woman in 1900's. Mileva could have been among the first women with the family versus career problem.