[4] He attended Northern Marianas College and University of Hawaiʻi at Mānoa, earning a bachelor's degree in communications at the latter.

[5] He previously served as minority leader from December 2018 until a coalition of Democrats snd independents won a majority in the 2020 general election.

[7] In December 2021, Propst was the subject of allegations of physical threats, made by a senior policy advisor from the office of the Governor.

[12] Propst, as an independent, was first elected to the Northern Marianas Islands House of Representatives in 2014, finishing second of seventeen candidates for six seats.

[15] In June 2020, Propst, and fellow incumbents Tina Sablan, Sheila Babauta, and Richard Lizama announced that they would run on the Democratic slate for reelection.

[16] In September 2020, Propst was accused of sexual misconduct, stemming from allegations dating back to his time spent working as a teacher.

[17] He announced his resignation from office later that month, stating that "this job can be extremely stressful and the attacks and cyber bullying seem to only worsen with each passing day.