Anyone interested in outsiders would do well to read Colin Wilson's "The Outsider".[1] It's a fascinating study of outsiders in literature, philosophy, and history, and an exploration of what makes them who they are.

More recently, Gary Lachman has picked up the torch, and has written on many Wilsonian subjects, including a biography of Colin Wilson, about which he speaks here: [2][3]

Howard Dossor's retrospective on Colin Wilson is also interesting.[4]

[1] - https://www.amazon.com/Outsider-Colin-Wilson/dp/0874772060

[2] - https://www.youtube.com/watch?v=qPm0Bi5nt_o

[3] - https://www.youtube.com/watch?v=k-MrjJJXRgk

[4] - https://www.youtube.com/watch?v=dHIOXNxZgOo