Einstein was a varied and prolific writer.
The lists below are some of the names of the papers Einstein has published. The list demonstrates that Einstein was somewhat varied in subject matter as an author. I often wondered if he was given other scientists patents and ideas to rewrite and to possibly put the 'correct' spin on because it is hard for me to imagine that for such technical papers, that Einstein would have time to conceive of, reconsider, write several drafts of and then write those papers all himself, even if co authored in such short time spans. The mental time needed for each paper take times to develop. I know PhD's who have spent years on one just one paper.
Some papers written by Einstein:
On a Heuristic Viewpoint Concerning the Production and Transformation of Light
On the Motion of Small Particles Suspended in a Stationary Liquid, as Required by the Molecular Kinetic Theory of Heat
On the Electrodynamics of Moving Bodies
Does the Inertia of a Body Depend Upon Its Energy Content?
Thermodynamic fluctuations and statistical physics
Principle of relativity.
Photon and Quantum
Old quantum theory
History of general relativity
Principle of equivalence,
Theory of relativity, and
Einstein field equations
Classical unified field theories
What Science says Einstein got wrong:
Unified field theory
Einstein was a prolific writer. Below you will find how many papers Einstein published per decade. Lot's of his papers were co authored but still, the list rivals Miles Mathis. I think I remember reading how prolific Einstein was as a writer here at CF but I couldn't find the post to link to it. I wanted to finish that thought and show the statistics. All my data is from the official party line: Albert Einstein Wiki
1901-1910 . . . 58 papers published
1911-1920 . . . 91 papers published
1921-1930 . . . 73 papers published
1931-1940 . . . 30 papers published
1941-1955 . . . 20 papers published
At his most prolific, Einstein published 24 papers in one year, 1905, smack dab in the middle of his years working at the Swiss Patent Office which was from 1902 to 1909. Einstein was an information machine.