My research is focused on the physics and geometry of thin surfaces. We have studied the crumpling, folding and wrinkling of soft and stiff elastic surfaces. Examples include the stretching of thin membranes to form wrinkles, the buckling of a sheet when pushed into a circular opening to form a d-cone, the folding of a circular latex membrane by rotation of its centre, etc.. We use analitical methods to understand the nature of these phenomena, and carry out simple experiments to help guide us.