How do senior executives, such as CEOs and CFOs, interact, select and appoint professional advisors? Based on a successful PhD project, the research in this book explores the interactions between advisors of large professional service firms and senior executive clients on an evidence-based academic level. The research journey and the author's reflections are charted step-by-step, providing an example of how to analyse unstructured qualitative data, reach theoretical saturation and capture emerging substantive theories. Moreover, by taking a unique holistic and inductive approach, this study offers a series of practical insights on how to combine and apply Kathy Charmaz' constructivist grounded theory with an auto-ethnographic stance. Divided into eight chapters, the author uses empirical data and rigorous analysis to uncover two distinct decision-making processes, namely (a) the client's decision to develop and maintain a relationship with the advisor and (b) to select and appoint the advisor for a particular project or services. Mapping these to one common conceptual framework a second complementary model emerges - a type of decision-making matrix with the foci 'competiveness, skills and merit', 'continuity and embeddedness', 'control and manage' and 'trust and empathy' - which offers the reader an alternative perspective of client decision-making. This book will be useful for practitioners and researchers alike who have an interest in understanding either naturalistic decision-making processes, the complexities of relationship development and procurement dynamics, as well as applied qualitative research methods.