At an early age, he began working for Congressman Dan Kildee. During this time, he was able to interact with his community hands-on, learning the importance of a community always having an advocate in the room. Rep. Martus graduated from Michigan State University's James Madison College with a degree in international relations and a minor in world religions. During his time as Michigan State, he worked for a number of state representatives. After graduating, he worked full-time as a communications advisor for the Michigan House Democrats.

Rep. Martus believes in the importance of representing the people he serves. His family and faith have instilled in him a commitment to helping others. This outlook is shaped by the hardworking and dedicated people of his community. His priorities include creating jobs to promote a flourishing economy; improving infrastructure in the community to ensure reliable travel for work and leisure; and advocating for Genesee County children by promoting an education system that prepares young people to get ahead in the modern economy. Rep. Martus serves in House leadership as vice chair of the Democratic Caucus. In this position, he plays a pivotal role in building consensus amongst his colleagues on legislative priorities. His committee assignments reflect his goal of ensuring that Genesee County always has a seat at the table. These include the Appropriations Committee; Health and Human Services Subcommittee (vice chair); Labor and Economic Opportunity Subcommittee (vice chair); Agriculture and Natural Resources Subcommittee (vice chair); Environment, Great Lakes, and Energy Subcommittee; and Licensing and Regulatory Affairs and Insurance and Financial Services Subcommittee.