Career choices in horticulture include: nursery technician, propagator, plant breeder, nursery manager, greenhouse grower, greenhouse manager, garden center manager, arborist/tree worker, landscape architect, landscape designer, grounds manager, landscape contractor, landscape maintenance contractor, golf course manager, and pest controller/advisor. Oceanographers are employed as researchers and/or educators by public and private research institutions, universities and colleges. Careers include laboratory or field technicians, water monitoring specialists, environmental protection workers, consultants, natural resource managers and sometimes careers working with marine animals at aquariums, theme parks, or research facilities. Most career options require more than two years of college study.