Gassankan or Yuèshān-guan [ 月山館; "Moon Mountain Hall" ] is a training activity near Seattle I lead that is focused on the development of skill at traditional internal martial arts and medieval weapons practices (e.g., sword, saber, long saber, spear) from both China and Japan.

I practice Northern Wú style Taijiquan [ 吳氏太極拳 ], Yin style Baguazhang [ 尹派八卦掌 ] and Hebei Xingyi Quan [ 冀形意拳 ] as taught in lineages preserved as part of Yin Cheng Gong Fa North America.

Wú Taiji is known for its relaxed character, giving practitioners the ability to off-balance an opponent at first touch by borrowing their force. Bagua is known for its smooth and fluid nature, giving practitioners the ability to change spontaneously in response to an opponent's actions. Xingyi is known for its stability, giving practitioners an ability to express sudden and explosive power.

I studied Jikishinkage-ryū kenjutsu at the Hōbyōkan [ 宝瓶館 ] under David Hall, reaching the level of chuden in 2018. I also trained in an unofficial line of Katori Shintō-ryū kenjutsu at Capital Aikikai, reaching the level of mokuroku in 2010. Previously, I had practiced Yagyū Shinkage-ryū in NYC in the mid 1990s. Much later I was able to continue that practice in DC and the PNW with my Hōbyōkan sponsor.

I now mentor a small group that meets as part of Lonin League, a martial arts cooperative in Seattle, where we train in the historical kata of Jikishinkage-ryū as the foundation of our practice . Over time, we incoporate free practice called jigeiko into our training. I try to inform this study as best I am able through my continued study of internal martial arts.

Because we train indedepently and have multiple influences, I have adopted the name Gassankan Heihō Kenjutsu for this activity instead of using the name of a historical ryūha.