<p>You should probably inspect the DOM of the block you're working with, all the information you need to manipulate the person picker is there.&nbsp; In this case clearing the hidden field value with class `js-person-id` and clearing the text label has the same effect as a postback for _btnSelectNone in the PersonPicker control:</p><p><a href="https://github.com/SparkDevNetwork/Rock/blob/develop/Rock/Web/UI/Controls/Pickers/PersonPicker.cs">https://github.com/SparkDevNetwork/Rock/blob/develop/Rock/Web/UI/Controls/Pickers/PersonPicker.cs</a>&nbsp;&nbsp;<br></p>