Final answer:
The two leadership theories that are recognized as most effective when combined are situational leadership theory and servant leadership theory.
Step-by-step explanation:
The two leadership theories that are recognized as most effective when combined are situational leadership theory and servant leadership theory. Situational leadership theory suggests that leaders should adapt their leadership style based on the situation and the needs of their followers. Servant leadership theory emphasizes the leader's focus on serving the needs of their followers, rather than prioritizing their own interests.