The OpenMx Development Team offers a Masterclass for the OpenMx extended structural equation modeling R package. OpenMx has a wide array of highly flexible and highly modular features (e.g., mixtures, multiple groups, time series, regularization, ordered categorical variables, multilevel, item response theory, hidden Markov models, etc.), but has a difficult learning curve. A goal of this workshop is ease that learning curve and thereby allow attendees to leave with the ability to fit a wider variety of models than they thought possible.