${\mathrm{\ell }}_1$ spreading models and FPP in Banach spaces with monotone Schauder basis

The main result of this paper is a fixed point result relating the spreading model structure of Banach spaces and Schauder basis with not too large basis constant. As a striking consequence, we deduce that every super-reflexive space has the fixed point property thus solving a long-standing open question in metric fixed point theory.