Our Team

Mariano Maggi & Quintago VA



Head Trainer, O'Neill Show Jumping

International Show Jumper, Sweden

Born into a passionate equestrian family in Mendoza, Argentina, Mariano Maggi's talent as both a rider and horseman has taken him all over the world. Maggi grew up experiencing every aspect of the industry, from breeding to competitive stints in polo, rodeo, 3-day-eventing and show jumping. A fifth-generation show jumper and student of Argentina's Military School of Equitation, Maggi achieved his first grand prix victory at just 15 years old. 


Originally representing Argentina, though in pursuit of bigger dreams, Mariano moved to Europe in 1999 and has represented the Swedish National Show Jumping Team since 2004 in numerous Nations Cups and CSI-Ranking competitions across the globe.  


Beyond Maggi's personal career, he has developed countless horses to the international grand prix level and trained many young riders to their own Nations Cup and European Championship appearances. He highly values the most important factor to the sport—horsemanship—as his raw style and beliefs are a testament to classic sportsmanship, respecting hard-work, honesty, and trust. 


Maggi moved to Santa Cruz, CA in the summer of 2018 and maintains his role as the head trainer at O’Neill Show Jumping. He relishes the ability to share his experiences and build new partnerships throughout the North American circuit.

Maggi is a respected clinician and offers availability for select clinics. For more information, contact us.

Clockwise of Greenhill Z & Uma O'Neill



International Show Jumper, New Zealand

Uma O'Neill burst onto the scene with her brilliant victory in the 2018 Longines FEI Jumping World Cup™ Vancouver, producing the only clear round over a testing 1.60m track at Thunderbird Show Park (CAN) aboard her longtime partner, Clockwise of Greenhill Z. The talented young professional rider took her first riding lessons while growing up in Hawaii before continuing her riding pursuits upon her family's move to California in 2008.

O'Neill had a quick ascent up the ranks, training with the likes of Benson Carroll, Ray Texel and Mariano Maggi. In a three-year span, she earned a team bronze medal with Zone 10 at the 2016 North American Junior and Young Rider Championships (USA); qualified for the 2017 USEF U-25 National Championship (USA); and claimed her World Cup title in Canada.

In 2019, O'Neill switched nationalities to represent New Zealand, a country with which she's held dual citizenship since she was a child. That same year, she made her senior Nations Cup debut at CSIO3* Drammen (NOR). A top candidate to represent her nation at upcoming Championships, O'Neill continues to train out of O'Neill Show Jumping in Santa Cruz, working alongside Maggi to develop a strong string of competition and sales horses.