We give short proofs of two classical results about the position of the extremal particle in a branching Brownian motion, one concerning the median position and another the almost sure behaviour.
"A simple path to asymptotics for the frontier of a branching Brownian motion." Ann. Probab. 41 (5) 3518 - 3541, September 2013. https://doi.org/10.1214/12-AOP753