Sebastian Plettenberg

is an internationally renowned GYROTONIC® and GYROKINESIS® Master Trainer conducting teacher trainings around the world. An award-winning choreographer, he received his ballet training at the National Ballet School in Germany and danced with many companies throughout Europe. His clients include dancers from American Ballet Theater, New York City Ballet, San Francisco Ballet and Boston Ballet. He also regularly sees professionals from Broadway as well as Olympic athletes.

Email Sebastian here


Osi Itzhaki

is a successful singer performing in New York City Cabarets and Jazz Clubs since 1998. She has recorded two Jazz Albums and is working on a third.

Osi is an authorized Pre-trainer of Gyrotonic®, Certified Level 1 in Gyrokinesis® and all Specialized Equipment.
The GYROTONIC EXPANSION SYSTEM® has helped Osi awaken her instincts and tap into sounds she had no idea existed in her vocal range.  These  unique breathing patterns along with the undulating  motions of the spine  have  helped Osi  find  a deeper connection to her music,  to her body and most important a deeper sensitivity and awareness to people


Erika Hassan

has studied dance for 15 years, and started her GYROTONIC® and Gyrokinesis training in 1993, when she met Juliu Horvath. She took private lessons with him for 3 years, which changed her body and her life in general! The training opened up a vision of dance from the inside out, so that outer forms are dictated by the energy within. She is a dancer and choreographer and Master Trainer in GYROTONIC and Gyrokinesis.






Allyson Ashley

Allyson began training as a student and teacher under Billy Macagone at Body Evolution studio.  She is a certified GYROTONIC® instructor and has completed Gyrokenisis® teacher training with Sebastian Plettenberg.  Allyson has a BFA from Southern Methodist University where she studied kinesiology in addition to ballet. After dancing with Dance Theatre of Harlem for four years,  Allyson has used time offstage to seek deeper understanding of energy as it relates to movement.  The GYROTONIC system has supplied her with a clear, focused mind and bodily facility strong and supple enough to express all facets of the human condition.  She hopes to guide all  of her clients toward much greater strength, flexibility and coordination for use in their own lifestyles.


Jackson Kellogg

began studying the GYROTONIC Method several years ago under master trainer Sebastian Plettenberg.  He was introduced to the system by his mother who has been an instructor for nearly a decade. He has since taught Gyrokinesis at several Ballet schools including the Central Pennsylvania Youth Ballet and the Miami City Ballet School.  He had the wonderful privilege of studying with Geta Constantinescu for two years in Miami.  Jackson spent his college years at the City University Of New York in Harlem, and greatly looks forward to returning to his home of New York.


Mathew Eisenhower

is an example of the impact that one Gyrotonic® session can have on a student . Matthew divides his life between teaching music at Public School 87 and teaching at Gyrotonic® Manhattan. He holds a B.S. in Music Therapy from Suny New Paltz,and a M.A. and Ed.M in Music Education from Columbia University. While pursuing his studies in Music Education, he explored and trained in the work of Joseph Pilates. Matthew traveled to Puerto Rico to study with “Pilates Elder” Lolita san Miguel . Matthew completed Gyrotonic® and Gyrokinesis® teacher training with Sebastian Plettenberg.




LeeAnn Morris

is a graduate of the California Maritime Academy. She comes to Gyrotonic® Manhattan after relocating from the San Francisco Bay area with her husband and two sons. LeeAnn is an active sports enthusiast enjoying competing in swimming, gymnastics and tennis. While rehabilitating from two spinal herniations, LeeAnn found Gyrotonic® and Gyrokinesis®. Upon recovery she became a certified Gyrotonic® instructor under Sebstian Plettenberg. LeeAnn is proud to be a teacher with Gyrotonic® Manhattan and happy to bring her love of Gyrotonic® and Gyrokinesis® to her clients.