Staff Bios


Stacy Rierson


Stacy loves it HOT! She loves hot tea, hot salsa, hot weather, and yes… HOT yoga!

Stacy will always consider herself a student of yoga. She has been practicing yoga ever since she was pregnant with her first son in 1999. Shortly after that first VHS tape, and a few classes later she realized the true benefits of yoga. Stacy believes yoga has the ability to transform all 3 pillars of life, “when I practice yoga, my mind is clearer, my body is leaner, and my soul is at peace”. Psychology and the mind/body/spirit connection drew Stacy even deeper into her practice. She brings humor, encouragement, and a non-judgmental attitude to her classes. Her goal is to make every student feel comfortable in their bodies, minds, and in their yoga practice. “Yoga is a vehicle to free yourself in the world. I try to give that spirit in the classroom. I want to help students deepen their practice by discovering confidence, inner peace, and internal beauty.”

Stacy completed her 200 hour Yoga Teaching Certification at Inner Fire Yoga in 2012 and is registered with Yoga Alliance. She also has a master’s degree in health psychology. Between her background in health psychology and yoga training she believes she has found her path of service. She is grateful for her family and friends who have supported and continue to support her journey as well as the teachers who trained her to be a teacher.

Andrea Horak


I was exposed to athletics at a very early age, which led to competing nationally and internationally as a gymnast. I always had love for learning and a strong desire to help others, so I made the decision to become a physician. I graduated from the Semmelweis University (Hungary) with an M.D. degree in 1990. We moved to the US, in 1992, and I worked at the St Joseph’s Cancer Institute in Tampa, FL. At this time, I developed an interest in the holistic approach to health and became trained in Chinese medicine.

I received my 200 Hour Yoga Alliance Certification through Inner Fire Teacher Training in 2012, and fell in love with the depths and endless layers yoga can offer. I’m continually seeking to grow as a teacher; I also committed to teach with safety and body awareness. My classes range from therapeutic and restorative style classes to energetic, strengthening Vinyasa Flows, recognizing the value in all methods of yoga.

I teach yoga because it enables me to combine my medical knowledge with my belief in the holistic approach to physical and emotional ailments. I firmly believe in the transformational power of yoga.

Favorite yoga quote: “It is a yoga practice, not a yoga perfect”

Fun fact: I have taken yoga classes in Mumbai, India.

Favorite day: Today

Peg Trehey


In 2005 yoga was recommended to me by my doctor as part of my recovery from a long illness. It didn’t take long before I began to notice the many benefits the practice has to offer. Yoga has been transformative for me. It has given me more inner and outer strength, energy and enables me to find a greater sense of balance, calmness and acceptance in my daily life.

Yoga became an increasingly important part of my quest for a healthy and positive lifestyle and I developed a passion to teach, guide and help others. I decided to become an instructor and obtained a certification in 2013 from Inner Fire Yoga Studio.

During my classes, I strive to create a nurturing and positive environment for you to explore and connect with your mind, body and spirit through asana, pranayama and meditation. I believe yoga can be transformative for everyone.

Previously, I was an elementary teacher for 17 years. I live with my husband and three children in Middleton. Along with my yoga practice, I enjoy running, cooking, reading and spending time with my family.


Katherine Vieau


Katherine began practicing yoga on a regular basis in 2008 as a compliment to running and cycling. As her practice evolved, she began to understand the power of the breath in connecting the mind, body and sprit together.

As a financial professional, she is able to bring yoga to her work place. She uses the techniques taught in class to bring clarity and peace to her day. Throughout her professional career, she has enjoyed helping others grow personally & professionally and sees yoga as another way to help others find their true purpose in life.

Katherine completed her 200-hour Yoga Teaching Certification at Inner Fire Yoga in 2014 and is registered with National Yoga Alliance. She enjoys studying the rich history of yoga and utilizing anatomy and alignment tools into her yoga practice and classes. Katherine enjoys teaching Vinyasa flow, Yin and Hot yoga. Her desire is for you to realize the true benefits of a consistent practice.

Katherine is married to her husband, Penn, who is also an active student of yoga. The couple resides here in Waunakee.

Betsy Delzer


Betsy Delzer is a teacher and Yoga instructor/Mindfulness Coach in the Middleton Public Schools, where she has taught art for the past 14 years. She has been certified through Street Yoga (Portland, OR) and has completed her 200 hour RYT through Haleybird Studios (Milwaukee, WI) where she learned to teach Yoga from an Integrative Yoga Therapy approach. Betsy is also the founder of the Om Yeah Yoga Movement, a movement that brings mindful practices to educators. She teaches an array of vinyasa-based yoga classes, attuned to alignment and the energetic systems within each of us.


Alyssa Ploessl


My name is Alyssa Ploessl and I am a 200 Hour RYT, working towards becoming an E-RYT. I received my teacher training at Dragonfly Hot Yoga during the spring of 2015. I was trained in the Vinyasa style, but I have a great interest in learning more about Yin as well. My teaching style is an expression of myself: very heartfelt, genuine and restorative, while also encouraging students to come out of their comfort zones and try new things. In my free time I enjoy reading, sketching, and spending time outside. I am very excited to begin teaching at Sapphire Yoga and Wellness! Namaste.

Valerie Hesslink


When I enrolled in yoga teacher training, I was unsure if I would teach yoga. My intention was to learn more about how to take the already profound experiences in my yoga practice and deepen them further in my bigger body. When I did decide that I wanted to teach yoga, my mission became clear to help others who are in bigger bodies, old bodies, stiff bodies – or bodies that can get ignored by the yoga world – and make yoga work for them.
I honor Yoga as an important mindful practice – but a lot of me comes through as I teach- silly, weird, and nerdy, with an occasional film or music reference. I offer teachings from a deeply nurturing and compassionate space. But most of all, I aim to empower you to live your life and unapologetically practice Yoga, Pilates, or any passion filled body movement – in the body you have today.


About Us

Sapphire Yoga & Wellness, LLC

202 S Century Ave
Waunakee, WI 53597

Book Now

Sign up for yoga classes and book appointments for skin care, waxing services, and infrared sauna times.


Claim Your Radiance
Skip to toolbar