What was the relationship between Albert Einstein and Nikola Tesla? Did they collaborate or simply admire each other's work?

Actually, Tesla had complete contempt for Albert Einstein’s work. He believed the theory of relativity was absurd, and favored the old nineteenth century idea of some kind of an “ether” in the vacuum of space, to explain why light travelled as a waveform in a vacuum. He believed that the notion that space and time were related was ridiculous and impossible. He did not believe that light speed represented an absolute limit. Tesla was quite emphatic on these points, and never changed his views, till the day he died, in 1943, at the age of 86. https://www.quora.com/unanswered/What-was-the-relationship-between-Albert-Einstein-and-Nikola-Tesla-Did-they-collaborate-or-simply-admire-each-others-work