Michael Kimmel is also frequently cited, but he's not just a sociologist interested in masculinities, he's a decidedly pro-feminist sociologist that is also hostile to Father's Rights groups.  He is the president of NOMAS and, to quote an article on the front page of his site today:

Want To Be A Good Dad? Support Mom And Avoid Father’s Rights Groups

Over the past decade, fatherhood has been all the rage and dads are naturally the talk of pundits on Father’s Day. So let’s say you’re a divorcing dad and you’re having trouble coping. You look for help on the internet and discover the father’s rights movement.

Be warned – avoid father’s rights groups like the plague. According to the pro-feminist men’s group The National Organization For Men Against Sexism (NOMAS), “male supremacist groups (“Father’s Rights”) have caused unspeakable harm to our country and to our children by encouraging abusive fathers, often with little past involvement with their children, to seek custody as a tactic to pressure a mother to return or to punish her for leaving. “Shared parenting”, “friendly parent”, involvement of both parents and other concepts that seem fair and benevolent have instead been used to manipulate courts and legislatures to help abusive fathers.

Again, these are feminist groups that, frankly, view men as biologically and culturally flawed to begin with and father's as unnecessary opining as to the beliefs and goals of people interested in father's rights and, here on Wikipedia, they are characterized as, not just authoritative sources for information on father's rights groups, but also members of those groups who act as their spokesman.  It should go without saying but quotes like the above and sources that make them would be universally reviled by anyone interested in father's rights advocacy.  When authors like this are cited it should be clarified that they are hostile to father's and father's rights and have views that are diametrically opposed to any that the mainstream FRM would actually espouse