Part I. Introduction.- Chapter 1. Introduction .- Part II. The Interviews.- Chapter 2. Tone Vangen, Assistant National Police Commissioner of Norway.- Chapter 3. Tor-Aksel Busch, Director of Public Prosecutions and the Regional Public Prosecution Offices 1997-2019 .- Chapter 4. Ellen Katrine Hætta, Chief of Police, Finnmark Police District.- Chapter 5. Terje Nybøe, Head of The Norwegian Bureau for the Investigation of Police Affairs.- Chapter 6. Odd Reidar Humlegård, National Police Commissioner in Norway from 2012-2018.- Chapter 7. Nina Skarpenes, College Director at the Norwegian Police University College.- Chapter 8. Nils Kristian Moe, Chief of Police, Trøndelag Police District.- Chapter 9. Hans Vik, Chief of Police, South Vest Police District.- Chapter 10. Kaare Songstad, Chief of Police, Vest Police District.- Chapter 11. Ole B. Sæverud, Chief of Police, South East Police District.- Chapter 12. Arne Jørgen Olafsen, Chief of National Police Immigration Service (NPIS).- Chapter 13. Anders Thornberg, Swedish National Police Commissioner 2018 - 2023.- Chapter 14. Jens Henrik Højbjerg, Danish National Police Commissioner 2009 - 2020.- Part III. ANALYSIS AND DISCUSSIONS.- Chapter 15. Analysis and Discussions.- Chapter 16. Selected Themes on Senior Police Executives Leadership.- Chapter 17. A Model for the Development of Senior Police Executives.