Having joined the club in April 2015 as head of football administration, Paul is now responsible for the day-to-day running of the American Express Elite Football Performance Centre in Lancing.
He will also continue to oversee various operational departments, including kit and equipment, facilities and maintenance, safety and security, first-team player liaison and catering for both our men's and women's teams.
Deputy chairman and chief executive Paul Barber said, "Paul is one of those all-too-often unsung heroes across the football world. Quietly getting on with the important day-to-day organisation and planning what is required to run our training centre to the highest possible standard.
"His meticulous eye for detail and well-thought-out approach to planning has been essential to our progress over the six years he has been with the club.
"He will now bring a wealth of experience to the board, from his time with The Football Association, working closely with the British Columbia Soccer Association in Vancouver, and his days as an apprentice at Sheffield Wednesday.
"On behalf of the chairman and directors I would like to welcome Paul to the board, and on behalf of everyone at the club congratulate him on this well-deserved promotion."
Paul Mullen added, "I have loved working here. It has been a great privilege to work for the club and be part of the progress we have made. I feel greatly honoured to now be invited onto the board, and would like to thank the directors for that opportunity."
Paul's career working in professional sport started as a teenager when he was an apprentice with Sheffield Wednesday under Howard Wilkinson, before moving to work in football administration with The FA, the British Columbia Soccer Association, and returning to England with Albion.
During his time with Albion he has also served as a member of the club's Women's and Girls' Football Club board, as well as a trustee of Albion in the Community (AITC), roles he will continue to fulfil.