GHF Billington is located on North Main Street in Southampton at Clearview Farm which is currently owned by the White family. The Farm has been in the White/Bishop family since Bill's great grandfather, on his mother's side, James Bishop, established it in the 1860's. Bishop raised cows, horses, and vegetables. Inspired by a southern view of the beautiful blue Atlantic, he named his farm Clearview. The industry of the farm has changed over the years, but the name has remained the same.  

After World War II Bill White's father converted Clearview into a potato farm.When Bill married  he and his wife, Lin did some farming of their own in upstate New York.  They returned to Clearview in the 1980's and decided to change the farm into an equestrian property for their three daughters, Morgan, Ashley and Brittan who loved horses.

The old potato barns were dark and subterranean-like ; unsuitable housing  for horses. With a knack for architectural design, White transformed the buildings into airy stables. During the reconstruction old foundations, windows, and doors from the original horse and dairy barns were discovered. These discoveries were restored and recycled into the new buildings. Clearview Farm came full circle – back to its original roots, recapturing its old world charm as it grew into a 32 stall haven dedicated to equestrian pursuits. Famous names in riding such as Conrad Holmfeld, Joe Fargis, and The Southampton Riding and Hunt Club have at times made it their home.

Today a lovely peace and stillness prevails under the ancient trees and down the dirt paths to the rolling fields and paddocks. There is palpable history here. Many come to the east end in search of just that. 


Tracy Mary Rivas Erin Stewart
more info... more info... more info...


Erin Stewart


< back to staff page
In 2001 with the help and support of my husband Mark, I left a rewarding career in marketing and opened Gray Horse Farm at our home in Upper Brookville. Our blended family included, Becky, five, Marissa, thirteen, and Daniel, nine. All of us working together, we restored the 1920’s brick barn, refurbished and expanded the old riding ring. Not too soon after, we added another barn and 4 more paddocks. When our Shetland pony named Coco and our semi-retired horse named Fairfield were safely stowed in their new stalls, we were ready for and optimistic about what would turn out to be the best twelve years of our lives.

I met Mary Rivas that first year Her positive energy fuelled my excitement. She became our trainer and would travel to Brookville every week for the next eleven years. When the children and I began competing we needed to upgrade our horse inventory. Soon we began importing special jumpers and hunters from Europe. It was fun, and challenging, and not always perfect, but my dream came true: happy children, good horses, and a dedicated trainer. We were blessed.

In 2009, the unthinkable happened. Mark was diagnosed with pancreatic cancer. Soon after the dreadful discovery he bought me my most treasured horse and I named her Halo. My husband died the next summer. Halo became my angel. I ride her in the adult jumper division and she has taken me safely from the starting tone to the last jump time after time. Halo watches over me at every jump. She gives her heart in every class and never lets me down, a faithful partner. Truly heaven sent.

Facing a new chapter in life, I decided to open a full- service stable in the Hamptons. When I drove up the dirt drive onto the old Clearview Farm on North Main Street in Southampton I knew this was it! In April 2012, Mary and I moved into a barn that needed a facelift by two women who loved hard work. It was like starting anew. We cleaned, repaired, renovated and redecorated. We mended fences and planted gardens; painted the Pony Palace, mowed the tall grass, settled in the horses, blessed the grooms, said a prayer, and opened for business in May. Gray Horse Farm LLC/Billington LL begins its second season this spring.

Mary Rivas


< back to staff page
  • 32 consecutive years on the Horse show circuit: short Stirrup through Grand Prix
  • Successful & competitive as a junior in ASPCA Maclay, USEF Hunt Seat Medal, and junior Hunters
  • Currently riding Professionally
  • Training ponies,Equitation, Hunters and Jumpers
  • Training with Todd Minikus and Nikki Simpson

Professional Resume

  • Mary has been qualifying junior riders for ASPCA Maclay and the USEF Medal Hunt seat Medal Finals since 1997
  • Junior Hunter and Pony Hunter Champions at the Winter Equestrian Festival in Wellington, FL and The Hampton Classic
  • Trained and qualified ponies and young riders for USEF Pony finals since 1999
  • Received the Zone II High Score Trainers award at the Pennsylvania National Horse Show in 1999 with Gray Horse Farms ,Large Pony Brighton's Sketch
  • Mary continues to enjoy achievements in all of the above while also coaching several Adult Amateur Owners who have trained with her for over a decade
  • Mary would like to acknowledge her past and current close working relationship and association to the following internationally acclaimed riders and trainers: Kent Farrington, Patricia Griffiths of Heritage Farm, Pamela Polk, Olympians Nona Garson, & Federico Stryzle

Riding Resume

Training is Mary's career. Riding is her passion. A life long pursuit of excellence in both has motivated her to continually raise the bar for herself and her students. Her professional program reflects a dedication to preserving the integrity of this great sport through practice, perseverance and patience, but most important: respect for each and every horse.

Mary's accomplishments include;

  • 7 years of Grand Prix competition with Placings at Winter Equestrian Festival
  • 2005 European Show Jumping Tour under Olympic Medalist Peter Leone

Memorable Mounts

Riders may not remember the ribbons they won for all their performances, but they will never forget the horse that was under them in every class of their career. Here are a few horses who taught Mary Rivas tools that she will use for the rest of her career in both teaching and riding and she would like to thank the following special horses:

  • Orion First Grand Prix Horse 2005-2009
  • Purple Rain Grand Prix Stallion 2009
  • D'artangan First Year Hunter 1999-2001
  • Damucles Performance Hunter 2000-2002
  • Valentino High Performance Hunter 2007-present
  • Longacre Jack Be Nimble Medium Pony Hunter 2003-2004
  • Brighton's Sketch Large Children's Pony Hunter 2003-2006

Mary Riding

Mary Riding

Erin Stewart


< back to staff page
Erin Riding2001
  • USEF Horse of the Year
  • Junior Hunter Grand Champion, CSI-W National Horse Show, NY
  • 3rd ASPCA Maclay Final, CSI-W National Horse show, NY
  • Best Child Rider, CSI-W Washington International, DC Junior Hunter Grand Champion, CSI-W Washington International, DC
  • Junior Hunter Grand Champion, Devon Horse Show, PA


  • 1st ASPCA Maclay Finals
  • USEF Horse of the Year
  • Junior Hunter Champion, National Horse Show
  • Best Child Rider, CSI-W Washington, DC
  • Junior Hunter Champion, CSI-W Washington, DC
  • 3rd WIHS equitation Finals, CSI-W Washington, DC
  • Best Child Rider, Pennsylvania National Horse Show, PA
  • Gold Medal Prix des States Team Final, Penn. National Horse Show, PA


  • 2nd NCHJA Welcome Stake, Raleigh, NC
  • 4th Grand Prix of Raleigh, Raleigh, NC
  • 1st High Amateur Owner Classic, Conyers, GA


  • 1st High Junior/Amateur Owner Classic, Cavalier Classic, Va
  • 2nd High Amateur Owner Classic, HITS Ocala, FL


  • 3rd Grand Prix, Palgrave, On


  • 3rd Ambassadors Cup, CSI-W Washington International, DC
  • Leading Amateur Owner Rider, CSI-W Washington International, DV


  • Top ten placings in Grand Prix competitions in California riding Devito


  • Circuit Champion Pre Green Hunter, HITS Thermal, CA

Erin Riding



Mary Rivas


Erin Stewart
Full service, ALL INCLUSIVE lesson fee.  
Includes unlimited lessons, exercising and ALL show training.
$2,500 per horse, per month
with Mary or Erin
All other GHF Billington trainer fees: $75 rate per 1/2 hour
$2,350 per horse, per month 
To Download a
Click here


Pony Camp

Scroll down for more photos
Sign up now to reserve your space for 2015

Camp Dates – June 30th-August 21st
Tuesday – Friday, 9am – 12pm

•  Skilled & friendly trainers
• All levels of riders welcome
• 6 years and older
• After camp private lessons available

For more information call:
(516) 903-5036
Download the registration form: Download Form
Pony Camp Pony Camp
Pony Camp Pony Camp
Pony Camp Pony Camp
Pony Camp  

© 2013 Gray Horse Farm Billington. All rights reserved.