[10] Callanan worked with the Bank of England for 12 months from July 2015,[11] and was a Fellow of the Royal Society of Arts.
Well known artworks include, "The Fundamental Units", a collaboration with the National Physical Laboratory imaging the world's lowest domination coins to massive scale using the latest microscopes.
[18][19] For another artwork, published by Book Works he sent letters to several world leaders saying "I respect your authority" and published replies by figures including Hosni Mubarak; critic Jonathan Jones (journalist) found the work humorous but struggled to find any point to it: "He sent out a letter to various presidents saying, "I respect your authority."
[23] While working at UCL Environment Institute he collaborated with science writer Richard Hamblyn[24] on a number of projects, documented in their book Data Soliloquies (Slade Press, 2009, ISBN 9780903305044).
[25] A Planetary Order (2009) combines satellite images into an advanced sculpture made using high-end 3D Printing, to show the planet earth covered in clouds.