We don't want to come over all gender stereotyping, but many people assume most cat owners are women.
Speaking to The Huffington Post, Williams explained that he found the way that society genderises animal ownership "very compelling".
"As a portrait photographer, I was interested in capturing the relationships of my male friends and their feline friends," he added.
"It was also a good excuse to hang out with a bunch of cats!"
Men featured in the series include a guy in a puffa jacket walking his cat on a lead, a tattooed hipster, a man in a shirt with his cat wrapped around his neck and an older man with a big bushy beard (and an equally bushy cat).
What do they have in common? They don't fit into one typical cat-owner stereotype.
"I want to show that regardless of the stereotypes put on cat ownership, many people have found the joy that cat companionship can bring," said Williams.
"I also want to stress how important it is to rescue your pets."
lady man does have a nice ring to it...