The qualified potential of employees undoubtedly ranks among the strategic success factors in companies. To achieve the highest possible performance contribution and job satisfaction, personnel development is also called upon to foster innovations. Advancement through personnel and career development has so far typically only been possible within the conventional, hierarchically structured leadership pyramid. However, there are employees who find their job satisfaction and performance strength in their professional competence, its development, and its application. For them, a specialist career path represents a desirable alternative to the traditional leadership career path, providing a strong incentive. This anthology, written by practitioners and scholars, does not aim to enthusiastically promote this form of career development. Instead, it seeks to contribute to the discussion about possibilities.