Who was Joe Stack? He was an engineer. Joe Stack was also person who saw injustice and tried to correct it as an engineer would, at least originally. He tried to hack the system. Similarly, John Brown attempted to make change by using his skills as a surveyor and quartermaster. Martin Luther King preached to organize, motivate, and persuade people. David Walker sewed pamphlets into the suits he tailored. All these people used their profession in a creative way to try to correct what they perceived as injustice.