This special issue of the American Mineralogist is dedicated to Michael J. Holdaway in honor of his nearly 40 years of contributions to the geosciences community. Metamorphic petrology has grown from a discipline based on field observation and interpretation to a quantitative discipline where experimental determinations on mineral stabilities provide a framework for quantitative petrogenetic grids and derivative tectonic interpretations, and theoretical activity modeling of detailed crystal chemistry establishes the link back to the real rocks.

Michael J. Holdaway has made fundamental contributions to each of these areas over his academic career. Mike was born down under in Canberra, Australia....

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