individualist:
(plural: ‘individualists‘; pronunciation: the letters ‘i’ rhyme with the letter ‘i’ in “ink”)

Alphonse Gallaud de la Pèrouse, (Zo d’Axa), French individualist (1864-1930)
a person who reacts to things (matters or issues) basing on his/her own ideas and understanding, but not under the influence of others or circumstances — related to actions and thinking;
a person who keeps to his/her independence, not allowing anyone to control or takeover his/her life;
a person who makes up his mind out of his own choice rather than because of the circumstances, i.e. he does not say ‘yes’ to something he does not believe in just because everybody else is saying ‘yes’ or if he does not say ‘yes’, he may lose some profit, someone’s favour or his good position in an office or organisation,

Simon Schama, an English individualist
Jackson is an individualist — he has his own set of theories and ideas and he follows it without allowing anybody to influence him; however, just because he’s an individualist, it doesn’t mean that he’s arrogant and impolite… he’s just an individualist.
Some of the popular individualists in the past are Henry David Thoriau, Josiah Werren, Benjamin R. Tucker, etc.
