Fontana Auto Repair

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George's Sierra Shell Team


Doug Whiteman – Owner / Manager

Doug Whiteman – Owner / Manager | Georges Sierra Shell

With over thirty years working in the business, Doug Whiteman is considered to be one of the top owners in the Auto Repair industry. Doug is a certified ASE Master Certified Technician, has been recognized as the NAPA Los Angeles Technician of the Year, and has been featured in numerous publications. Away from work, he participates in multiple groups featuring independent shop owners and is known throughout the industry for his high standards of customer service.

Recently, Doug has discovered a passion for helping other struggling shop owners. Along with managing his business, he serves as a consultant for the Automotive Training Institute where he has helped hundreds of shop owners turn around their failing businesses. When Doug is not caring for our customers he enjoys spending time with his wife Linda and his children, Josh and Karley.

Linda Whiteman – Owner / Office Assistant

Linda Whiteman – Owner / Office Assistant | Georges Sierra Shell

Linda has been involved in the station for over 28 years, assisting in the backroom office and helping with community projects.  In December of 2013, Linda led our “Christmas Truck” Giveaway, where we gave away a Ford F-250 to a local family in-need. Linda was able to gather a number of donations from local businesses to fill the bed of the truck with toys and gifts for the family!

Her favorite memory of the station was in 1996, when she and Doug were able to watch the station go through a complete remodel. She can recall her son Josh, who was two at the time, watching all of the cranes and excavators work on the station with amazement.

Doug and Linda’s son Josh currently attends school at California State University, Monterey Bay where he is obtaining a degree in business. Their daughter Karley attends the University of Colorado Pueblo where she is studying Psychology. Karley is attending the university on both an academic and Soccer scholarship. In their spare time, their family enjoys camping, traveling and attending church at Water Of Life in Fontana, California.

Meet Our Amazing Team of Service Advisors and Fontana Mechanics at George’s Shell!

Heather Stanton – Service Manager

Heather Stanton – Service Manager | Georges Sierra Shell

An employee of over 18 years, Heather is the most recognized employee at George’s Shell. After being hired as a cashier, Doug quickly recognized Heather’s outstanding customer service skills and promoted her into the Service Bays. Heather assumed the role of Service Manager in 2011 and continues to build relationships with new customers daily. Heather enjoys the relationships created with customers, many of whom have become lifelong friends.

Heather holds two ASE Certifications, for both Service Advisor and Parts Specialist and plans on obtaining her Air Conditioning ASE Certification soon. 

Jessica Machuca - Service Writer

Jessica Machuca | George's Sierra Shell

Jessica has been with George's Shell for 14 years

Her hobbies include watching sports, Camping and hanging out with her family.


Cynthia Estrada

Cynthia Estrada | Georges Sierra Shell

Cynthia has been with George's Shell for 7 years.

She started on the convenience store side of the business, Doug quickly noticed her attention to customer service so he started training her as a service advisor. Her pleasant attitude and ability to speak Spanish allows her to be able to communicate with our Spanish speaking community.

She is currently attending CSUSB and getting her degree in Chemistry pursuing a career Forensic Science.

Sujeily Cortez

Sujeily Cortez | Georges Sierra Shell

Sujeily has been with us for 4 months and has been a great addition to George's Shell. She originally started her career in the heavy duty trucking industry.

She enjoys camping and four wheeling with her husband.



Julio Mendez – Technician

Julio Mendez | George's Sierra Shell

Julio has been with George's Shell since December of 2019 and has over 10 years of heavy duty mechanic experience.

He is married with two daughters and enjoys spending time with family when not working.



Jorge Andara – Technician

Julio Mendez | George's Sierra Shell

Jorge is an ASE certified Technician with 8 years in the field.  Currently, he is working on obtaining his ASE master certification and smog license

In his spare time he enjoys racing his 1977 Pontiac Firebird, going to the beach, spending time with family and friends and going to car shows.



Josh Whiteman

Josh Whiteman | Georges Sierra Shell

Josh is the grandson of George, who started the business in 1972. He is the third generation working in the family business and hopes to continue the standard of excellence for years to come. After high school he attended Cal State Monterey Bay, pursuing Business Administration. After that, he moved back to Fontana to help the family business. Josh currently has 12 ASE certifications, is a Certified Master Automotive Technician, a Certified Advanced Level Specialist, and is a licensed Smog Tech.

In his free time he enjoys working on his Subaru WRX. He has built the motor, swapped a bigger turbo as well as all the supporting modifications. He takes it to car shows and car meets all over Southern California. He also plays disc golf regularly, competing in tournaments all over the west coast.

Josh enjoys working for the family business and does a variety of different things, from working on cars to overseeing the environmental side. He looks forward to providing the community with great trust and customer service that they have come to expect!

Edwin Duran – Mini Mart Assistant Manager

Edwin Duran | George's Sierra Shell

Edwin has been with George's Shell since October of 2018 when he started out as a cashier in the convenience store. Linda noticed his ability to take more responsibility and promoted him.

He overseas the mini mart scheduling, daily bookkeeping, taking care of the vendors and ordering product.

He is currently double majoring in Intercultural Communication and Behavioral Science at Chaffey College.

In his spare time he enjoys spending time with family, friends, his dogs or collecting music.

Enrique Valencia - Lead Cashier

Enrique Valencia Machuca | George's Sierra Shell

Enrique Valencia has been George's Shell over 2 years now

Hobbies include working out/ Physical Fitness , Working on his car and car shows.

George's Sierra Shell is committed to ensuring effective communication and digital accessibility to all users. We are continually improving the user experience for everyone, and apply the relevant accessibility standards to achieve these goals. We welcome your feedback. Please call George's Sierra Shell (909) 822-3402 if you have any issues in accessing any area of our website.