Congratulations to Joji Nishibuchi who has successfully completed his Master's degree under the advisement of Professor Alejandro Strachan. Joji's research focused on vibrational properties and point defects in the calcium lanthanum sulfide (CLS) solid solution via density functional theory. During his research, he Identified favorability of oxygen uptake in CLS, corroborating experimentally observed oxygen impurities in experimentally synthesized CLS samples.