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Einstein
married Mileva Marić on January 6, 1903. Einstein's marriage to Mileva,
who was a mathematician, was both a personal and intellectual
partnership: Einstein referred to Mileva as "a creature who is my equal
and who is as strong and independent as I am".
On
May 14, 1904, the couple's first son, Hans Albert Einstein, was born.
In 1904, Einstein's position at the Swiss Patent Office was made
permanent. He obtained his doctorate after submitting his thesis "A new
determination of molecular dimensions" in 1905.
That
same year, he wrote four articles that provided the foundation of
modern physics, without much scientific literature to which he could
refer or many scientific colleagues with whom he could discuss the
theories. Most physicists agree that three of those papers (on Brownian
motion, the photoelectric effect, and special relativity) deserved
Nobel Prizes. Only the paper on the photoelectric effect would win one.
This is ironic, not only because Einstein is far better-known for
relativity, but also because the photoelectric effect is a quantum
phenomenon, and Einstein became somewhat disenchanted with the path
quantum theory would take. What makes these papers remarkable is that,
in each case, Einstein boldly took an idea from theoretical physics to
its logical consequences and managed to explain experimental results
that had baffled scientists for decades.
(http://www.mlahanas.de/Physics/Bios/AlbertEinstein.html)