Watson alianza kazi yake kwenye jukwaa na kujiunga na Royal Shakespeare Company mwaka 1992. Mwaka 2002, alicheza katika uzalishaji wa Twelfth Night na Uncle Vanya katika Donmar Warehouse, na aliteuliwa kwa Tuzo ya Olivier ya 2003 kwa Mchezaji Bora. Filamu zake zingine ni pamoja na The Boxer (1997), Angela's Ashes (1999), Gosford Park (2001), Punch-Drunk Love (2002), Red Dragon (2002), Maisha na Kifo cha Peter Sellers (2004), Mwili Bride (2005), Miss Potter (2006), Synecdoche, New York (2008), Oranges na Sunshine (2010), War Horse (2011), The Theory of Everything (2014) na Kingsman: The Golden Circle (2017). Swali: Watson alianzaje kazi yake?
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