In addition to collaborating in the development of smoking cessation interventions among adolescent and adult smokers with affective vulnerability and biobehavioral research of stress and smoking cessation, he has pursued rigorous psychometric evaluation of clinical assessment instruments to aid both in the precision of measurement and conceptual clarity of key latent constructs in the study of addictions. Recent collaborations within the Brown Medical School have generated manuscripts describing the utility of using taxometrics and item response models to examine the psychometric properties of existing clinical measures of nicotine dependence, nicotine withdrawal, alcohol problems, affective vulnerability, and problem gambling.