* Thomas Andrews: The managing director of Harland and Wolff, the shipyard that built the Titanic, was heavily involved in overseeing the entire design and construction process. He was known as the "ship's architect" and was aboard the Titanic during its maiden voyage.
* Alexander Carlisle: The chief naval architect of Harland and Wolff, he was responsible for the initial design concepts and calculations for the Titanic. He was also responsible for the overall layout and arrangement of the ship.
* Frederick Barrett: Barrett was the company's chief draughtsman and played a vital role in translating Carlisle's design into detailed blueprints for construction.
* J. Bruce Ismay: The managing director of the White Star Line, Ismay was involved in the overall concept and specification of the Titanic. He provided the company's vision and requirements for the ship, including its size, luxury, and speed.
While these were key players in the Titanic's design, many other engineers, draftsmen, and skilled workers contributed to its construction. It was a complex project that involved the combined effort of numerous individuals.