Yes, Albert Einstein discussed his theory of relativity with several scientists and colleagues before he published it. One of the key individuals with whom Einstein discussed his ideas was his close friend and collaborator, Michele Besso.
Michele Besso was an engineer and mathematician, and he and Einstein became friends while studying together at the Polytechnic Institute in Zurich, Switzerland. They maintained a lifelong friendship and frequently engaged in scientific discussions. Besso served as a sounding board for Einstein, allowing him to explore and refine his ideas.
In their conversations, Einstein discussed his evolving thoughts on the theory of relativity. Besso was one of the few individuals who fully understood and appreciated Einstein's ideas, and their discussions greatly influenced Einstein's thinking. Besso's mathematical skills and deep understanding of physics allowed him to provide valuable insights and feedback to Einstein.
It is important to note that Einstein's theory of relativity was a culmination of years of intensive research and personal reflection. While discussions with Besso were influential, they were not the sole factor in shaping Einstein's ideas. Einstein's own intellectual prowess, extensive study of physics, and collaboration with other scientists all played a role in the development of his revolutionary theory.