What kind of people is most likely to become a boss? A salesperson, an engineer?

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Many people want to become their own boss. Before one become a boss, he might work for others, so what kind of professional position has more opportunities to become a boss? Many people tell me that the salesperson is easier to become his own boss. Because if you have customers you can sell products made yourself or bought from a third party, but if you don't have customers you will fail even if you have the best product. If you are a boss now, please tell me who were you before you became a boss, a salesperson, an engineer, or any others? If you are going to become a boss, what would you do yourself? Marketing or mastering the technical skills? If you are not a boss and are not willing to become a boss, then please tell me what the boss , you're most familiar with, did before they became a boss. Note, here a boss is a founder or co-founder of a company, not a professional manager.