Final answer:
The behavioral and social-cognitive perspectives emphasize environmental influences on personality, with behavioral theory focusing on reinforcement and consequences, and social-cognitive theory on reciprocal determinism.
Step-by-step explanation:
The two personality theories that place the greatest emphasis on environmental influences on personality are the behavioral and social-cognitive perspectives. The behavioral perspective, notably associated with B.F. Skinner, posits that personality is shaped significantly by the reinforcements and consequences of one's environment, emphasizing that behavior is consistent based on prior learning. Moreover, social-cognitive theorists like Albert Bandura highlight reciprocal determinism, which signifies a mutual influence among behaviors, cognitive factors, and environment, indicating that while environment affects behavior, individuals can simultaneously influence their surroundings. Bandura also introduced concepts such as observational learning and self-efficacy, adding to our understanding of environmental impacts on personality development.