Joseph beuys' lifelong mission was to

Joseph Beuys' lifelong mission was to heal society.

Explanation:

Following the war and a neurotic failure, he re-invented himself as an interpreter – starting his enduring mission to heal society as he himself had been recovered throughout the war.

Beuys made himself into a work of painting. For his whole work, he attired in his brand trappings of jeans – a fresh pair every day – a white shirt, a netting undershirt covered in useful pockets, and a pressed trilby cap from Lock and Co of St James, London. The wool-felt wool of the hat had a realistic use: it covered the two alloy silverware that Beuys had in his scalp, as a consequence of his wartime wounds, from the extreme of hot and cold. He was seldom seen without the trilby, kidding to his assistant and companion Caroline Tisdall: “the hat could do it on its own.”

so, not gonna do the actual thing because that's just laziness for an easy assignment like this.

but someone that has a lot of information and interesting details about is picasso. you can easily write a 500 word essay about him and how overtime his paintings of himself got more and more deformed representing that he was forgetting what he looked like and that was from memory.