"[5] Also in 2013, he was nominated for a New York Innovative Theatre Award for Outstanding Solo Performance, for the one-man play Generic Magic Realism, by Edmond Malin.

[6] Cassidy was inducted into the Indie Theater Hall of Fame for his contributions to the NY independent theatre scene, and was described as "an actor, director, and playwright of surprising range and depth.

[12] Nat frequently continues his work with Gideon Media, also appearing in their audio adaptations of the movie Witness[13] (published by Audible), the play Almalem,[14] and the original, multi-season production Give Me Away.

[15] Cassidy has a reputation for writing "darkly comic plays with one foot in horror and the other in literary allusion," and often feature historical characters.

[20] His play Any Day Now was also nominated for two NY IT Awards that same year, and took home Outstanding Actress in a Lead Role (Elyse Mirto).

In 2011, his Lovecraft-inspired one-man show, I Am Providence or, All I Really Needed to Know about the Stygian Nightmare into Which Mankind Will Inevitably Be Devoured, Its Fruitless Screams of Agony Resounding in the Unending Chasm of Indifferent Space as It Is Digested by Squamous and Eldritch Horrors beyond Comprehension for All of Eternity, I Learned from Howard Phillips Lovecraft, won the NY IT Award for Outstanding Solo Performance.

[45] In 2024, the Line-Up described Nat as the "Stephen King of TikTok," due to the "many readers including [his works] on their top reading lists.