In 2005, Mossessian established the architectural studio of Mossessian & Partners, where he serves as principal architect. His first building design in London was the Carmine Building, 5 Merchant Square, a 15-storey office building at Five Merchant Square. As part of the
Paddington Basin Development, the building was topped off in 2009, by the
Mayor of London,
Boris Johnson. In 2010, Mossessian & Partners completed three buildings: 5 Merchant Square (headquarters for Marks and Spencers) in
Paddington,
London; ExxonMobil Headquarters in
Shanghai,
China; and a private residence in
Sorede,
France. In 2011, the company won an open international competition for an urban renewal project in the Medina of
Fes,
Morocco which is now on site. In 2015 the practice was renamed Mossessian Architecture. Since that time Mossessian Architecture has designed 4 phases of a regeneration scheme in Doha (Msheireb), two buildings in Central London's King's Cross area, and won an international competition to design a museum of the Islamic Faith in Makkah, Saudi Arabia. Outside of the practice, Mossessian lectures widely at schools of architecture and cultural institutions. Currently he is a visiting professor at Imperial College London where he lectures on how architecture affects well-being. He also personally organises events to promote innovation and development in the industry. == Design approach ==