Embodiments of the present invention generally relate to epicardial heart rhythm management. In some embodiments a method is provided for managing heart rhythm by implanting a pa device within the pericardial space of a patient. In some embodiments, an implantable device is provided for pacing the epicardial surface of a patient. The device may include a first module coupled to a second module by a tether. The first and second modules may be selectively placed for bi-ventricular pacing or for dual chamber pacing in some embodiments. Optionally the modules may be separate and may wirelessly communicate with one another and may also communicate with a heart stimulation device programmer. Optionally, a plurality of devices may be implanted in the pericardial space. A delivery device for delivering the implantable device to the pericardial space is also provided. Further embodiments provide implant retrieval devices and methods.