This book contributes to two domains. Firstly, it identifies and develops an understanding of the essence of design ethnography, and a process by which designers can harness ethnographic methods for the purposes of design practice. Secondly, it provides an example of a designer ethnographic approach to product design for older people, producing insights and product design requirements for cooking and heating products. The research involved design ethnographic fieldwork over twelve months within the homes of forty older adult participants across Ireland and from various socio-economic groups. Personas, design requirements, and concepts were produced, which allowed the researcher to reflect on the role of design ethnographer and inform future practice. Insights into product requirement were deep and far reaching, revealing important and diverse health and wellbeing needs to be addressed for older people in domestic products. A methods and process framework is formulated for conducting future design ethnography, from fieldwork and data analysis to design practice.