As of my knowledge cutoff date in early 2023, Alex Marshall is perhaps best known as a pseudonym for Jesse Bullington, an American author of speculative fiction. Under the name Alex Marshall, Bullington wrote "The Crimson Empire" trilogy, which includes the titles "A Crown for Cold Silver," "A Blade of Black Steel," and "A War in Crimson Embers." These novels are characterized by their blend of epic fantasy elements with dark humour and subversive twists on classic genre tropes. Marshall's works under this pseudonym have been praised for their strong character development and expansive, detailed world-building. Prior to adopting the Alex Marshall pen name, Jesse Bullington was recognized for works such as "The Sad Tale of the Brothers Grossbart" and other novels that meld historical fiction with fantastical or horror elements.