Rollo Tomassi is an American author and blogger known within the online "manosphere" for his writing on dating, relationships, and gender dynamics from a "red pill" perspective. Writing under a pseudonym, he built an online following through his blog before rising to prominence with his self-published book The Rational Male, followed by sequels including The Rational Male: Preventive Medicine and The Rational Male: Positive Masculinity. His work centers on evolutionary psychology-based theories of male-female relationship dynamics, attraction, and what he terms "hypergamy," ideas that have made him one of the most cited figures within red pill and men's rights online communities. His books and podcast have built a significant following among men seeking frameworks for understanding dating and relationships, while also drawing substantial criticism from psychologists and commentators who characterize his ideas as pseudo-scientific and promoting a distorted view of women and relationships.