The term "paired careers" refers to career arrangements wherein two or more individuals bind their professional trajectories together over time. Pairs are distinguished along two dimensions: their genesis (from a task-based or an affection-based relationship) and the roles performed by the partners (complementary or interchangeable). Together, these dimensions shape a two-by-two matrix. The phenomenon of paired careers is studied in this document by considering four cases of paired careers that illustrate each of the quadrants of the genesis-roles matrix. The first career pairing, which involves a film director and his brother, who has produced his movies for more than 20 years, illustrates an affective genesis and complementary, nonhierachical career roles. The second career pairing, which involves two brothers who have been co-presidents of a Spanish bank since 1989, illustrates genesis from an affective relation with initially complementary and later interchangeable roles. The third career pair, which involves the chief executive officer (CEO) and chief operating officer of a major U.S. corporation, illustrates task-based genesis and complementary, hierarchical roles. The fourth career pair, which involves two co-CEOs of a major U.S. investment firm, illustrates a task-based genesis and interchangeable roles. An analysis of the four cases and the pertinent literature reveals conditions conducive to long-lasting, tightly coupled careers. The document contains 47 references. (MN)