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Telescope Array (TA) has recently published results of nearly nine years of$X_{\mathrm{max}}$ observations providing its highest statistics measurement ofultra high energy cosmic ray (UHECR) mass composition to date for energiesexceeding $10^{18.2}$ eV. This analysis measured agreement of observed datawith results expected for four different single elements. Instead of relyingonly on the first and second moments of $X_{\mathrm{max}}$ distributions, weemploy a morphological test of agreement between data and Monte Carlo to allowfor systematic uncertainties in data and in current UHECR hadronic models.Results of this latest analysis and implications of UHECR composition observedby TA are presented. TA can utilize different analysis methods to understandcomposition as both a crosscheck on results and as a tool to understandsystematics affecting $X_{\mathrm{max}}$ measurements. The different analysisefforts underway at TA to understand composition are also discussed.

Measurements of UHECR Mass Composition by Telescope Array