Brennan Lee Mulligan is an American comedian, writer, actor, and Dungeon Master best known as the creative force behind Dimension 20, the hit actual-play Dungeons & Dragons series on Dropout. Known for his razor-sharp improv, emotional storytelling, and intense commitment to character, Brennan has become one of the most beloved figures in the tabletop RPG (TTRPG) world. From CollegeHumor sketches to his podcast Worlds Beyond Number, his work blends nerd culture, theatre, and heartfelt chaos in a way fans can’t get enough of.
Brennan Lee Mulligan Wiki/Bio
| Full Name | Brennan Lee Mulligan |
| Date of Birth | January 4, 1988 |
| Age | 37 years (as of 2025) |
| Profession | Comedian, Writer, Actor, Dungeon Master |
| Known For | Dimension 20, Game Changer, Strong Female Protagonist, Worlds Beyond Number |
| Hometown | New York City, USA |
| Current Residence | Los Angeles, California, USA |
| Nationality | American (of Irish descent) |
| Zodiac Sign | Capricorn |
| @brennanleemulligan |
Physical Details
| Attribute | Details |
| Height | 5’9” (175 cm) |
Brennan Lee Mulligan Early Life
Brennan was born into a creative family in New York City—his mother, Elaine Lee, is an actress and writer, and his father, Joe Mulligan, a comedian. His early exposure to the arts and fantasy storytelling shaped his love for games and performance. He started playing Dungeons & Dragons at age 9 and was gamemastering by 10.
As a teen, Brennan joined The Wayfinder Experience, a live-action roleplay camp where he later became head writer. He was homeschooled, which gave him the flexibility to chase his passions while dealing with school bullying. By 17, he had earned an associate degree in philosophy and humanities from SUNY Ulster.
Brennan Lee Mulligan Education
| School | Homeschooled |
| College | SUNY Ulster (Philosophy & Humanities, 2005) |
| School of Visual Arts (BFA, Screenwriting, 2009) | |
| Other Training | Upright Citizens Brigade (Improv) |
His formal education in writing and philosophy, combined with improv training at UCB, laid the groundwork for his career as a storyteller and performer.
Brennan Lee Mulligan Family Details
| Father | Joe Mulligan (Comedian) |
| Mother | Elaine Lee (Actress, Writer) |
| Spouse | Isabella “Izzy” Roland (Married in 2023) |
| Children | Daughter “Sunny” (b. 2023) |
| Marital Status | Married |
Brennan met fellow comedian Izzy Roland at UCB in 2017. They got engaged in 2021 and married in 2023. Their daughter “Sunny” was born the same year, with Brennan announcing her birth via Worlds Beyond Number‘s Patreon.
Brennan Lee Mulligan Career Highlights
Brennan joined CollegeHumor in 2017, where his sketch “Tide CEO” went viral. He soon became a central figure on Dropout, writing and starring in Game Changer, Make Some Noise, and more. His biggest creation, Dimension 20, launched in 2018 and redefined the TTRPG space with high production, heartfelt arcs, and Brennan’s legendary storytelling.
Outside Dropout, he’s worked with Critical Role, serving as DM for Exandria Unlimited: Calamity and Downfall, and co-founded the top-ranking podcast Worlds Beyond Number with Erika Ishii, Lou Wilson, and Aabria Iyengar.
Career Timeline
| Milestone | Details |
| Improv Debut | Upright Citizens Brigade (UCB) |
| Sketch Comedy | CollegeHumor, joined in 2017 |
| Major Series | Dimension 20 (Creator/DM, 2018–present) |
| Other Shows | Game Changer, Make Some Noise, Very Important People |
| Notable Podcast | Worlds Beyond Number (Launched 2023) |
| Critical Role DM | Calamity (2022), Downfall (2024), Divergence (2025) |
| Awards | Webby Award (2019), NY Fringe Festival – Excellence in Performance |
Brennan Lee Mulligan Net Worth and Income
| Estimated Net Worth | $1.5–2 million (as of 2025) |
| Income Sources | Dropout shows, Patreon (Worlds Beyond Number), Cameo, Live Shows |
He earns through multiple platforms—Dropout salary, high-profile live tours like Hammersmith Apollo 2024, and a hugely successful Patreon podcast.
Brennan Lee Mulligan Recent Updates
2023
- Married Izzy Roland in April.
- Became a dad—announced daughter’s birth in January 2024.
- Co-founded Worlds Beyond Number, reaching top 20 on Patreon.
- Led a D&D-themed WGA strike protest called “AMPTiamat”.
2024
- DMed Critical Role: Downfall in July.
- Starred in Game Changer and Make Some Noise.
- Took Dimension 20 on a UK/Ireland tour.
2025
- DMed Exandria Unlimited: Divergence.
- Appeared in Game Changer episode “Fool’s Gold”, jokingly pretending to quit Dropout.
- Continued Dimension 20 and Worlds Beyond Number, with new live shows in the works.
