They will report into the agency’s creative director Nigel Roberts and are to work on the Patek Philippe, Ecuador Tourism, Street Invest and Stop the Traffik accounts.
Styling themselves as a creative think tank The Quacker Factory, Fitzsimons and Crothers have worked with agencies including VCCP, HDMG, Beattie McGuinness Bungay, Saatchi & Saatchi and Publicis on successful pitches for Easy-forex.com, Ancestry.com and Zoopla.co.uk.
Fitzsimons started his career at MacLaren McCann in Canada in 2005, and freelanced at agencies including Adam & Eve, DLKW Lowe, Rainey Kelley Campbell Roalfe/Y&R from 2007.
He had a stint at Hurrell Dawson Moseley & Grimmer, now Enter, between 2010 and 2012, and most recently worked on a freelance basis at Inferno.
Crothers started out as a freelance copywriter at Lida and later freelanced at VCCP Blue, HMDG, and WCRS.
Roberts said: "Dave and Pete are excellent strategic thinkers, and have craft skills beyond others with twice their experience. They will be a great addition to the agency."