Frank Croaro, Founder

Organizational Lineage

Modern Sin (Shin) Moo Hapkido schools generally trace authority through:

• Ji, Han Jae directly
• Certified Sin Moo masters/grand-masters by him
• The World Sin Moo Hapkido Organization (started in 2002 in Korea) and related organizations

Because Hapkido historically fragmented into many organizations and Kwans, lineage claims can vary significantly between schools. In practice, “direct lineage to Ji, Han Jae” is often treated as the defining legitimacy marker inside the Sin Moo community.

Historical Significance

Ji, Han Jae is often considered one of the most influential figures in all of Hapkido history, not merely Sin Moo Hapkido because he:

• Helped structure and popularize Hapkido internationally
• Integrated Korean kicking systems into the art
• Helped connect Hapkido to the government and military circles
• Introduced a more internal/philosophical dimension through Sin Moo

He also became known internationally through martial arts films, including training Bruce Lee and working with him in “Game of Death”.