He was the author of bestseller "No Second Earth (두 번째 지구는 없다)" and  a cast member of hit TV shows such as JTBC's Non-Summit[1] and tvN's Hot Brain: Problematic Men.

"[8] Being the son of an immigrant and growing up in Vermont, near the Canada – US border, where a lot of people speak English and French, he was interested in other languages at a young age.

[13] He said that Non-Summit supported the government scholarship, including a year of language training, that he and his co-star Ghanaian Sam Okyere were part of, when he started on the show.

[18] In February 2015, he became a recurring member of the cast of the Non-Summit spinoff reality-travel show Where Is My Friend's Home, starring for ten episodes, through April, 2015, for the first two trips to China and to Belgium.

[2][24] The show is also referred to as "brain-sexy man" using a newly coined term that is becoming popular in Korea, and Rasch is called "an American student who speaks very fluent and high-standard Korean".

[25] He writes newspaper columns for JoongAng Ilbo, with topics like "study abroad",[26] and guests on talk shows, including Arirang TV's News Tellers to discuss education, immigration, jobs, and current affairs issues.

[32] In April 2015, he and Non-Summit cast member Ilya Belyakov attended a ceremony for the new "Koreans and Foreigners Together" program as Honorary Culture Sharing Ambassadors of the Korea Foundation.

[33] On January 12, 2016, he and Non-Summit cast members Guillaume Patry, Alberto Mondi and Zhang Yuan, along with Psy and violinist Clara-Jumi Kang, received the Corea Image Communication Institute awards, for their work in bridging cultural understanding between Koreans and non-Koreans.