The physical and psychological health benefits associated with expressive writing (EW) have been extensively studied (Frattaroli, 2006; Frisina et al., 2004; review by Pennebaker, 2018; Smyth, 1998). Despite the depth of this research, two important questions remain why is EW beneficial and who chooses to engage in EW. This study addresses these two questions by using a mixed methods procedure, which includes teachers’ written products about significant teaching experiences during the COVID-19 pandemic as well as their ratings of positive affect (PA) and negative affect (NA) before and after writing, and their ratings of the impact of the event they wrote about. Narratives were coded for levels of meaning-making and self-regulation with acceptable reliability among four raters. Results showed an immediate small decrease in NA after writing (d=.30) and an immediate small to moderate increase in PA after writing (d=.38). Additionally, correlational analyses revealed that higher levels of narrative meaning-making were related to higher levels of pre-writing NA, but not changes in NA or PA. Conversely, higher levels of narrative self-regulation were not related to pre-writing affect, but were significantly related to adaptive changes in immediate post-writing affect (increase in PA and decrease in NA). Two logistic regression models, one predicting who completed the first expressive writing session and one predicting who volunteered to receive information about the next phase of the study (i.e., additional writing sessions) were not significant. However, a logistic regression predicting whether a participant completed a second writing prompt using change in affect and narrative quality as predictors was significant. Narrative self-regulation was the only significant predictor, such that higher self-regulation was related to an increase in the likelihood of completion of a second prompt. Overall, results suggest that meaning-making and self-regulation are related to different outcomes associated with participants’ affect, with self-regulation being associated not only with adaptive change in affect, but also with continuing to engage with EW.