Who is Maverick?

From Online Etymology Dictionary:

maverick
1867, "calf or yearling found without an owner's brand," in allusion to Samuel A. Maverick (1803-70), Texas cattle owner who was negligent in branding his calves. Sense of "individualist, unconventional person" is first recorded 1886, via notion of "masterless."

Negligent in branding his cattle? Not knowing whom he picks and what they do? Has to say "Oops!" and "I screwed up" a lot? It's beginning to make sense now...

Also note that the original Maverick was born 205 years ago.