The purpose of this mixed methods doctoral study was to conduct a needs assessment of the diabetes-specific educational priorities and technological preferences of fathers of youth ages 6-17 years with type 1 diabetes (T1D). The results were used to build a prototype of the mobile diabetes education Web site, mDAD: Mobile Diabetes Advice for Dads.Method(s): Thirty fathers of youth with T1D ages 6-17 years were recruited to complete two online surveys and participate in individual, semi-structured interviews to explore educational needs and elicit design preferences for the mobile Web site. Closed-ended responses from the surveys, along with coded data from the interviews, were analyzed with SPSS, v22 to produce descriptive statistics and compare differences between groups. Descriptive qualitative analysis of the interview transcripts was conducted to identify themes, latent priorities, and trends. Fathers’ preferences were integrated into the design of the prototype mobile Web site, which was then evaluated by participants for its usability, design, accessibility, and content.Results: Thirty fathers (mean age = 47.7 years) of youth with T1D (mean age = 12.5 years) participated in the needs assessment. Nineteen diabetes topical areas were assessed, with fathers identifying a mean of 11 needs per father. Ninety-three (93%) of all fathers, and 100% of fathers of youth 13-17 years identified at least one diabetes-specific educational need. Significant differences in needs between groups were identified. All fathers reported smartphone ownership, with 97% using the device daily, and 93% using the device to find information online. Seventy percent (70%) were willing to spend between 11-40 minutes learning more about diabetes per week, and 77% indicated they would be willing to receive information about diabetes 2 or more days per week. Fathers’ feedback on the prototype mobile Web site was analyzed and used to refine its design and content.Discussion & Conclusions: This study identified unmet diabetes-specific educational needs of fathers of youth with T1D, and used these findings to build a prototype mobile Web site to address these needs. The findings suggest it is feasible and acceptable to deliver diabetes education to fathers via mobile technology.