Still a young man of 36, Andrews, a Belfast native, had already earned a reputation as a genius due to his innovative and brilliant ship designs. Overseeing dozens of draftsmen, Andrews was ultimately responsible for the thousands of plans that became Titanic. His design stressed both progress and tradition: incorporating newer technologies while including proven equipment to support them. A perfect example of this approach was Titanic's triple screw propulsion system: the Ship's center propeller was powered by relatively new turbine technology, while its two outer propellers were turned by the giant pistons of reciprocating engines. Even while at sea, Andrews took constant notes about the minor and major improvements that Titanic needed. Surprisingly, Andrews had been asked at the last minute to travel on Titanic because Harland & Wolff's Managing Director, Lord William J. Pirrie, had taken ill.