Former Welsh Rugby Union performance manager Huw Wiltshire has joined London Welsh to oversee team development and conditioning.
Wiltshire joins from the University of Wales Institute, Cardiff (Uwic) having also lately been involved in Russia's World Cup build-up.
He joins four weeks after Lyn Jones became The Exiles' new boss, signalling a desire to reach England's top flight.
Wiltshire said: "I look forward to supporting a young and talented squad."
The former Pontypridd and Cardiff Blues conditioning coach will have the title of performance advisor.
He joined the WRU from the Blues in 2005 and was national sports science & performance manager by the time he left in 2010 to take a senior Uwic role in performance analysis and management.