Meet the Oxygen Concentrator Store Team

Management | Oxygen Specialists | Customer Service and Warehouse

Customer Service and Warehouse Management

Larry Manring AMSR Picture

Larry Manring  Customer Service Manager

  • 1-877-303-9289

Larry joined American Medical in the early September of 2020. Originally from Oregon, he spent 15 years in South East Idaho where he worked as a Fire Captain/Paramedic before moving to Denver. He enjoys the outdoors, golfing, and watching the Raiders play.

Jay Brownson AMSR Picture

Jay Brownson  Warehouse Manager

  • 1-877-303-9289

Jay is originally from Mandeville, LA, but lived his last 4 years in Baton Rouge, LA. He brings with him managerial acumen from a construction supply company where he was Operations Manager for many years.

He says, "I am a nerd at heart and that’s why I can handle myself with a computer. Even though I nerd out, I like to do outdoor activities. Hiking and fishing are the top outdoor activities that I enjoy the most. I am happily married, going on 2 years, but been together for 9 years. We have a yellow lab named Waffles, which is my side piece. I got lucky enough to land this job on Sept 20, 2019. My wife and I were moving here anyway to be closer to her family, but right before that happen, I got a chance to interview for this job. I manage a great crew at this branch and I believe we are making strides to improve service to make this company only get better."

Customer Service

Tammy Moore AMSR Picture

Tammy Moore  Customer Service Rep

  • 1-877-303-9289

Tammy Moore joined AMSR in August 2016. She enjoys spending time with friends and family. Graduated Summa Cum Laude from Peirce College in PA with a Bachelors in Legal Studies. Future goals include going to the beach and seeing her son graduate college and get married. She is passionate about assisting you with your oxygen needs!

John Brooks AMSR Picture

John Brooks  Customer Service Rep

  • 1-877-303-9289

"John joined AMSR in February of 2020. He is originally from Wyoming but has been and lived around the world. He has lived in Germany, Turkey, Iraq, Kuwait, and England as well as 10 states in the U.S. He is a two-time Veteran with both the Air Force for Desert Shield and Army with Iraq Freedom.

He attends a lot of music concerts, most tickets are from bands that he has met personally or interviewed when he was a DJ for a radio station in Montana. He has hiked almost all the Continental Divide trail From Pikes Peak to the Canadian border. He is a proud single parent of his son and plans on getting married to his best friend sometime soon.

Linda Ganje AMSR Picture

Linda Ganje Rental Specialist

  • Email Linda Ganje
  • Call Linda Ganje
  • 303-483-7154

Linda joined AMSR in 2008 and has been factory trained by Sequal, Inogen, Respironics, Invacare, AirSep, Inova Labs and DeVilbiss. She enjoys educating people about the various oxygen concentrator options and assisting them in selecting the products that best fit their needs. She loves to see the joy and the freedom that oxygen concentrators bring to their lives.

Kristina Maynard  AMSR Picture

Kristina Maynard  Buy Back Specialist

  • Email Kristina Maynard
  • Call Kristina Maynard
  • 303-483-7137

Kristina joined AMSR in September of 2015, choosing to relocate to Colorado from the West Coast. Thrilled to contribute to a locally owned company that dedicates itself to being preeminent in our industry. Outside the office, Kristina enjoys music, jewelry and vintage cars.

Joshua D’Estrada AMSR Picture

Joshua D’Estrada Warehouse Technician

  • Email Joshua D’Estrada
  • Call Joshua D’Estrada
  • 303-483-7164

Joshua, a Colorado native, attended Metropolitan State University and has over 14 years of experience in both sales and the customer experience. Outside of work, Joshua enjoys music and golfing.


Bryn McGary AMSR Picture

Bryn McGary Warehouse Technician

  • Email Bryn McGary
  • Call Bryn McGary
  • 303-799-0013

Bryn moved from Arcadia California to Colorado in 1991 and has over 8 years of experience in the shipping and receiving field. Outside of work she enjoys hiking, camping, and spending time with her family, friends, and 8 year old Rottweiler Basset Hound, Mara.

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