Nolo and this blog is created within the course of our employment. That makes Nolo the copyright owner. In other words, once these words ejected from our cerebrum and fixed on this screen, we relinquished ownership (a disclosure likely to haunt us during a future deposition.)
Author/Owner issues. In your question, the blogger is not an employee. Typically, the only way that a non-employee gives up ownership to blog material is by a written transfer (typically an assignment or a work made for hire agreement). But in your question, the blogger is a part-time owner. That raises a different set of issues. What type of business form is it -- partnership, LLC or corporation? If it is a corporation or LLC and the blogger is an officer, the blogger/owner may have written or fiduciary obligations. Alternatively, the corporation's or LLC's owners may have obligations not to compete -- something that might occur if the material was used for other purposes. If it is a partnership (the default for a group of owners who don't do anything formal), is the blog-writing considered part of the blogger/partner's contribution? That may affect claims to ownership. Finally, if the blog is derived from existing company-generated material or research there may be co-authorship or co-ownership issues. That doesn't mean the blogger can't republish it ... but the blogger would have to account to the co-authors if any money was earned.