Full Idea
I take existentialism to be the focus on the freedom and self-making of the human being, and his or her insertion into the world.
Gist of Idea
Existentialism focuses on freedom and self-making, and insertion into the world
Source
Robin Le Poidevin (Interview with Baggini and Stangroom [2001], p.222)
Book Reference
Baggini,J/Stangroom,J: 'New British Philosophy' [Routledge 2002], p.222
A Reaction
I take 'self-making' to be the key here. If neuroscientists somehow 'proved' that there was no free will, I don't see that making any difference to existentialism. 'Insertion' seems odd, unless it refers to growing up.