The key note speech will discuss how ’postconstructionist’ onto-epistemologies, which take into account the entanglement of discourse and matter, and hence arts and sciences, can be useful for feminist theorizing. Examples will be taken from the work of feminist theorists such as Donna Haraway and Karen Barad, as well as from my own research on queerfeminist widowhood and corpomaterialist feminist approaches to death, dying and mourning.