[4] A founding member of New York's Mobius Group Productions in 1998, Marcarelli produced and performed in works by Eric Bogosian, Warren Leight, and Richard Nelson.

starring Cynthia Silver, which The New York Times called "irresistible,"[6] won the Fringe's overall excellence award for an outstanding solo show.

[9] In 2002 Marcarelli started appearing as the "Test Man" character in Verizon Wireless commercials,[7] for which Entertainment Weekly named him one of the most intriguing people of 2002.

[11] Prior to Verizon, Marcarelli had already appeared in numerous commercials for companies including Old Navy, Merrill Lynch, Dasani, T-Mobile, and Heineken.

He also performed in industrial and promotional films, and as a voiceover artist for Comedy Central, United Airlines, and Aetna Insurance, among others.