Meet our trainers.

All of our trainers are qualified horse people who are interested in teaching their knowledge and sharing their experiences.


Tosca Kocken started her riding career at the age of 9. Tosca went on to compete as a junior rider all over Canada, Washington, Oregon, California, Arizona and the Eastern United States.  Tosca won the CEF Medal finals in 1983, placed third at the ASPCA Maclay finals and nineth at the USET Finals in 1984 on her horse Stepenwolfe.  From 1991 to 1993, Tosca showed in the Open Section 1 and 2 at Spruce Meadows, on her horse Charon, with very good placings.  Tosca has also won the BCHJA Amy Dundas Memorial Trophy for Best BC Bred Jumper 6 years in a row and won the Baby Green and Young Horses Development Champion in 2007 for her horse “Hey you”.  

Tosca is a familiar face at horse shows throughout Canada and the United States.  She is an Equine Canada Certified Coach.  She has bred, trained and taken many students and their horses to championship levels.  In 2000, Tosca built Twin Rivers Equestrian Centre with a vision of offering a centre that provides excellence in all aspects of equestrian riding.  The atmosphere at Twin Rivers is one of strong horsemanship, safety and fun.  She welcomes every type of equestrian and is continuing to develop her business and farm into one of the finest in the Lower Mainland and takes great pride in that fact.


Erin of Chaplin Equestrian has joined the team as our professional rider and will be coaching alongside Tosca Kocken. Erin has a wide range of experience as a professional rider of hunters, jumpers and young horses all over North America and Europe. She has managed and groomed top horses competing up to the 5* FEI level and is looking forward to sharing her experience with our barn family. Erin is an Equine Canada certified coach. Check out her website and socials to learn more about her! @chaplin. 


Ann grew up in Southern California and began riding at 11 years old. When her family moved to Canada they bought a small farm in Maple Ridge where Ann began pony club and mentoring with Norah Ross to Level B. She has had success on the A circuit in hunter/ jumper and equitation as a junior and amateur and was lucky enough to compete at classic venues like Thunderbird and Spruce Meadows.

When one of Ann’s students enrolled at the University of British Columbia they were looking for a riding coach which Ann took on for several years.

Tosca and Ann met at age 14 while training with Michael Patrick and their careers brought them together again when Tosca built Twin Rivers and Ann joined as a coach.

Ann is passionate for horses and her teaching and training style reflect her belief that a strong education foundation is imperative to success in the show ring. She holds a current Equine Canada coaching certificate, first aid certificate, EC rider mentor program & developing instructors certificate.

Ann still continues to train, show and coach and is thrilled to return to Twin Rivers.


With a remarkable two-decade presence in the hunter/jumper scene, Alex brings a wealth of experience to our barn. Alex has travelled across Canada, New Zealand, and the US having worked with many Grand Prix riders including our very own Tosca Kocken, the Blair family (NZ), Kyle King, and Andrea Strain.

Alex has competed in the jumpers with placings in the open division up to 1.15m. Recently, his passion over the last few years has been bringing along a homebred young horse and will continue competing once his school schedule allows.

As a certified Equine Canada Competition Coach, Alex's expertise is firmly rooted in a decade of transformative work as a therapeutic riding instructor at PRDA. Beyond the arena, Alex has his diploma in special education from KPU and spent 8 years working with students in the Langley school district. Alex is currently pursuing a degree in Integrated Studies at UFV and working towards his Bachelor of Education.

We're thrilled to have Alex enriching our Twin Rivers family with his expertise in coaching and passion for all things equestrian.


Martina’s equestrian journey started at an early age, inspired by her mother’s deep love of horses. At the age of 13, she began training under the expert guidance of Tosca. Since then, Martina has competed in numerous shows across the Lower Mainland. In 2022, she won the BCHJA Provincial Reserve Championship and continues to place well in both hunters and jumpers. 

Martina has a current certified Equine Canada coaching certificate and her goal is to teach and mentor the next generation of riders and provide riders with a solid foundation from which they can grow their riding careers.