statement regarding de grey's employment affirming that while his actions "did substantiate instances of poor judgment and boundary-crossing behaviors, dr. de grey is not a sexual predator." bibliography de grey, aubrey (1999). the mitochondrial free radical theory of aging. austin: r.g. landes company. isbn 1-57059-564-x. de grey, aubrey, ed. (2004). strategies for engineered negligible senescence: why genuine control of aging may be foreseeable. annals of the new york academy of sciences. isbn 978-1573314961. de grey, aubrey; rae, michael (2007). ending aging: the rejuvenation breakthroughs that could reverse human aging in our lifetime. new york: st. martin's press. isbn 978-0-312-36706-0. oclc 132583222. polymath, d. h. j. (april 2018). "hadwiger-nelson problem (polymath project page)".