Planned absences from work include scheduled time off, retirement, and sabbaticals. There are also allowances for taking vacations and sabbaticals without losing one's seniority. Faculty go on sabbaticals at foreign universities to encourage research and teaching interactions. A number of faculty have served as Acting Principal during vacancies and sabbaticals. While there, he completed sabbaticals at Walt Disney Imagineering and Electronic Arts (EA). Aris had several other sabbaticals over his 40-year career. Two sabbaticals based in MMU Cheshire and the other five in Manchester. American university professor Robert H. Billigmeier, spent his sabbaticals in Ilanz. Merzenich took two sabbaticals from UCSF in 1997 and 2004. During his time at Yale, Nouwen took several sabbaticals, some of which informed his writing. Returning from his sabbaticals to Christ Church, Meyer continued as its pastor until 1909. During her sabbaticals, they traveled internationally and lived in France, Greece, Italy, and Mexico. Cowley joked that he missed seven sabbaticals. Bill Watterson took two sabbaticals from the daily requirements of producing the strip. He has taken sabbaticals in France and Chile.