There is no career path.
Journalism is probably the best background.
You learn to meet a deadline and you learn that your prose can be changed and sometimes improved by others. The best educational background is probably history or English literature although curiosity and being in a state of constant research make up for any lapses in your education. In a business or organizational setting it generally happens that if you do a good job on some editorial project like a brochure, position paper, or research report you may be asked to put together some talking points or a speech. If things work out and you're reliable and consistent you will be called on again and depending on the size and nature of the organization, you may find speeches are your main concern. Many will also be heavily involved with annual report production or editorial projects for the executive office.