[1] Kruk conducted research on shared parenting after divorce or separation, particularly highlighting the importance of the father's involvement to the children's well-being.
Taking an international perspective, Kruk has noted that the gender aspect of the shared parenting discussion is very different across the world.
In contrast, many women's organizations in Canada and the US are against shared parenting, with some going so far as to characterize it as a "fathers' rights conspiracy".
After research again disproved this claim, a third wave of criticism acknowledged that while shared parenting may be the best solution for most children, there should be no presumptions in custody proceedings, so that each judge can decide what arrangement is in the best interest of a child.
[11][12] As part of his work on family mediation, Kruk determined that it was important for the children of divorced parents to have an active relationship with their grandparents.
He concluded that grandparents "often play a vital role in helping grandchildren adjust to the consequences of parental divorce, providing a sanctuary for the emotional needs of their grandchildren at a time when parents, faced by the multiple losses and transitions attendant to divorce, maybe less emotionally available and responsive to their children.