Heroux's work as a state representative included creating a $38 million school internet infrastructure grant program that offered money to school districts all over Massachusetts,[7][8] was a cosponsor of the transgender public accommodation bill,[9] which is now law as the Massachusetts Gender Identity Anti-Discrimination Initiative,[10] was a cosponsor of the ban on gay conversion therapy,[11] which is now law,[12] adding money to several state budgets for homeless children's programs,[13] and fought to try to get the state to measure prison program outcomes on reducing recidivism.

[26][27][28] Heroux has made efforts to recruit women and people of color fill vacancies on city boards and commissions.

[29] Heroux promoted advanced training in unconscious bias, duty to intervene to prevent excessive force, and de-escalation training for city police officers,[30][31] and made sure that every firefighter has two sets of protective fire gear for the first time in city department history by funding in the budget every year.

[72] In 2017, Heroux published a book on US foreign policy in the Middle East,[73][74] has lived in Saudi Arabia,[75] and has been to North Korea,[76] Israel and Palestine including the West Bank.

[78] Heroux, after earning instructor level ranks, also taught Jeet Kune Do, Filipino Kali, and Jiu Jitsu at a studio he opened at 19 years old.

[72] From October to November 2018, Heroux took a 12-day, 8,500-mile (13,700 km) road trip across 24 states and Canada with his dog Mura, posting pictures on his Facebook page.