Einstein married Mileva Maric on 6 January 1903. They had two sons but their daughter Lieserl died in childhood. At the time of Mileva's death in 1948 her eldest son Hans Albert was a Professor in Hydraulic Engineering at the University of California, Berkley. Mileva Maric, a Serbian mathematician, was Einstein's companion, colleague and confidante whose influence was enormous during Einstein's most creative years. At the age of 21, Mileva enrolled with the Swiss Federal Polytechnic in 1896, the same year as Einstein, who was three-and-a-half years younger than Mileva. Newly married Einstein was working 6 days a week at the Patent Office, and the rest of his time was spent on physics. Mileva tried to cope with the loss of her career and the loss of her daughter. The following year went well. Albert got a raise and Mileva gave birth to Hans Albert.
