Mezue nkebi ahịrịokwu a: N'asọmpi Olimpik nke United States nke afọ 2012 e mere n'Omaha, Nebraska, bụ́ nke e ji ama ndị ga-eso n'Òtù Olimpik nke United States, Hansen meriri n'asọmpi ikpeazụ nke ịgba mmiri ruo mita 100 site n'ịgba mmiri ruo n'obi, nke mere ka o ruo eruo igwu mmiri n'asọmpi ahụ nakwa n'asọmpi ịgba mmiri ruo mita 4 n'ọsọ mita 100 n'asọmpi Olimpik nke afọ 2012. Ọ gbakwara ọsọ n'ogologo narị mita abụọ, bụ́ nke o ji aka ya gbaa n'obi, o wee bụrụ onye nke anọ n'ọsọ ahụ. Na 2012 Summer Olympics na London, Hansen mechara nke atọ na 100 mita breaststroke maka ọla nchara, ma merie ọla edo dị ka onye so na ndị otu mmeri US na
4×100-metre medley relay. Na mmechi nke egwuregwu ahụ, Hansen kpebiri na asọmpi Olympic nke 2012 ga-abụ nke ikpeazụ ya, na-ala ezumike nká n'egwuregwu igwu mmiri.