[1] He operated the Charles M. Higgins Company to manufacture the drawing ink he invented.

[1] He was a founding member of the Kings County Historical Society.

[4] Higgins was the co-founder and treasurer of the Anti-Vaccination League of America.

[7] Historian James Colgrove noted that Higgins "attempted to overturn the New York State's law mandating vaccination of students in public schools.

[5] Higgins was criticized by medical experts for spreading misinformation and ignoring facts as to the efficacy of vaccination.