Military Leader
ISTJs would likely make great military leaders, as they are strong, driven, and structured. They may appreciate authority and are often comfortable enforcing rules and working toward regular, specific goals.
Surgeon
ISTJs are knowledgeable and focused - qualities that would likely serve them well as surgeons. Though they may need to work on their bedside manner when communicating with patients, ISTJs may work well in a detail-oriented role, like surgery, that requires them to remain calm and solve problems in a practical, functional way.
Accountant
ISTJs’ natural attention to detail and patience when working through a problem would probably help them work well as accountants. They tend to enjoy working closely with numbers and analyzing data, which means that a role in finance may serve them well.
Lawyer
Since they tend to feel comfortable pushing back against other people and enjoy thoroughly analyzing the details of a case, ISTJs would likely work well as lawyers. They may need to practice feeling comfortable in front of groups of people or working closely with clients. Once they learn how to communicate better with others, ISTJs may enjoy working in law.
Judge
ISTJs tend to be naturally objective people who take their time before coming to a conclusion. As judges, ISTJs would likely be able to hear both sides of the story, analyze the evidence, and make an impartial, thoughtful decision.
Police Officer
ISTJs may enjoy enforcing rules and maintaining a larger, societal structure. They tend to possess the strengths in objectivity and analysis required to serve in law enforcement.