<a href="[[~[[*parent]]]]author/[[*publishedby:userinfo=`fullname`]]">[[*publishedby:userinfo=`fullname`]]</a>
This question has been answered by markh. See the first response.
<a href="[[~[[*parent]]]]/author[[*publishedby:userinfo=`fullname`]]">[[*publishedby:userinfo=`fullname`]]</a>
<a href="[[~[[*parent]]]]/author/[[*publishedby:userinfo=`fullname`]]">[[*publishedby:userinfo=`fullname`]]</a>
<a href="[[~27]]?[[*publishedby:userinfo=`fullname`]]">[[*publishedby:userinfo=`fullname`]]</a>
<a href="[[~27]]?author=[[*publishedby:userinfo=`fullname`]]">[[*publishedby:userinfo=`fullname`]]</a>