An apparatus for mounting a portable electronic device in a vehicle includes an element that is compressible or expandable, first and second grips, and a device holder configured to selectively hold a portable electronic device. The element has first and second ends spaced apart from one another by a first distance when the element is in its uncompressed or unexpanded state. The first and second ends are movable towards or away from one another by application of an external force that causes the ends to be spaced apart from one another by less or more than the first distance. The element is biased to try to return to its uncompressed or unexpanded state when the external force is not being applied. The first and second grips extend from the first and second ends of the element and are configured to grip a pair of spaced apart vehicle headrest posts.