  This white paper advocates for the creation of a community-wide program to
maintain precise mid-transit times of exoplanets that would likely be targeted
by future platforms. Given the sheer number of targets that will require
careful monitoring between now and the launch of the next generation of
exoplanet characterization missions, this network will initially be devised as
a citizen science project -- focused on the numerous amateur astronomers, small
universities and community colleges and high schools that have access to modest
sized telescopes and off-the-shelf CCDs.
