Sean Griswold


Sean calls Durango, Colorado home, where he lives with his wife and three kids. He is the first employee of Sierra Chemicals, which started back in July 1994. Sean purchased Sierra Chemicals in 2005. He hopes to lead in his position as President with empathy and insight from 26 years of industry experience.

Daryl R. Hillyer

Safety Director

Mr. Hillyer has over 30-years’ experience as a Safety Professional and has been working with Sierra Chemicals for 15 years. He was also the President/CEO of a successful safety consulting business in Western Colorado (Safety, Inc.). He worked for the Department of Energy (DOE) as a Trainer, Radiation Officer, Site Safety Officer, and Training Manager. He spent 9-years in the U.S. Nuclear Submarine Navy, serving his country with an honorable discharge.

Shedrick Lewis

VP of Operations

Shedrick has over 25 years of service in the Industrial Cleaning Industry and has held many roles within safety, sales and operations (most recently VP of Operations). Shedrick enjoys the outdoors and spending time with family and friends. Shedrick studied Business Administration - General Business at Lamar University.


David Navarrete

National Sales Manager


David is responsible for the overall sales division and sales team across the country. David lives in Grand Prairie, TX with his family. David has been with Sierra since 2017 and is always available for questions or direction on projects you have planned. When David is not working, he enjoys spending his time with his wife, Shea, of 21 years and his 12 - year old Daughter, Lourdes. Besides his passion in helping customers find solutions, fitness and family are David’s true passions in life.

Danielle VanZeebroeck

Account Manager Zone 1 Western Rockies


Danielle grew up in Southern California and moved to Colorado to attend college. She obtained a B.S. in Accountancy in 2012 from Fort Lewis College. After graduation Danielle worked in Public Accounting on the Front Range but eventually found herself drawn back to Durango. Danielle began working at Sierra Chemicals in 2018. When not at work Danielle is most likely snowboarding or enjoying the great outdoors.

Brian Veitz

Field Service Sales Zone 2 - North Dakota


Brian Veitz is the sales representative for the Williston Basin area and beyond. He holds a B.Sc. in Physics and has over 8 years of oil & gas experience.

James Price

Field Service Sales Zone 3 - N. Oklahoma, Texas Panhandle & Kansas


Employed 6 years within the last 12 years with Sierra 15 years of experience with chemical applications- primarily for water and production/pipeline treatment. I am passionate about problem solving and finding the best solution for my customers.

Roger Terry

Business Development Manager Zones 4 & 5 - Permian Basin S. Texas & S. Louisiana


I have been with Sierra Chemicals almost 7 years. My career here has been committed to field service sales and helping find good, safe and effective solutions to our customer’s challenges. At Sierra Chemicals we have a team approach to sales. We draw upon our excellent safety team, operations team and the administrative staff; to bring forth clear and comprehensive solutions to our customer’s needs. I am responsible for covering zones 4 and 5, which includes South Texas, South Louisiana and West Texas regions.
I am happily married, and my wife and I have 8 children between the two of us, that keep us on our toes. I enjoy Mountain biking, endurance cycling, trail running, kayaking and all things outdoors. My Lutheran Christian faith is very important to me and is the framework in which I aim to conduct all my life; including my family life, vocation, church life and involvement in my community.

Keenon Ward

Account Manager Zone 4 - Permain Basin


Hi, my name is Keenon Ward, I am the account manager for Zone 4 (Permian Basin/NM). I have been in Sales since graduating from Texas Tech university with my B.A. in Business Administration in 2017, as well as being a team captain on the football team for 3 years. My wife and I both Tech alumni and have a son named Karter. Outside of work and being with my family; I enjoy playing golf, deer hunting, or anything outdoors that allows me to compete. Developing strong relationships is the foundation of everything I do, both professionally and personally. One of my favorite quotes is, “People will forget what you said, people will forget what you did, but people will NEVER forget the way you made them feel."

Jesse Carranco

Account Manager Zone 5 - S. Texas & S. Louisiana


Jesse is the Account Manager for Sierra Chemicals covering the South Texas and Southern Louisiana Territory. Jesse establishes strong relationships, answers questions, and identifies new opportunities with our existing clients. Jesse has several years of account management experience. When not at work with Sierra, Jesse enjoy’s spending time with family and friends and participating in any outdoor activities.

Matt Miller

Field Service Sales Zone 7 - N Texas, S Oklahoma, N Louisiana


I have been with Sierra Chemicals almost 3 years. My career here has been committed to field service sales and helping find good, safe and effective solutions to our customer’s challenges. At Sierra Chemicals we have a team approach to sales. We draw upon our excellent safety team, operations team and the administrative staff; to bring forth clear and comprehensive solutions to our customer’s needs. I am responsible for covering zone 7, which includes North Texas, Louisiana and Oklahoma. When I’m not working, I enjoy spending time with family and friends. I enjoy all types of outdoor activities. I still enjoy watching and playing sports of all kinds. Still to this day seek competition in any form.

Lucas Boyd

Field Service Sales Zone 8 - PA, OH & WV


Lucas Boyd has a long background in sales, safety, and project management. Lucas has close to 5 years of experience in the oil/gas industry in various positions and also 5 years of experience promoting and delivering training programs geared toward industry, oil and natural gas, manufacturing and construction.


Eric Mount

Regional Operations Manager/Project Manager

Eric Mount has strong leadership and relationship skills. He has over 10 years of supervisory skills. He started off as a foreman with Sierra Chemicals and moved up to Regional Operations Manager. Eric loves spending time with his wife and two daughters and traveling.

Marvin Adair Jr.

Operations Manager / Sr Project Manager

Marvin Adair is the Operations and Project management leader with extensive experience overseeing and managing operations and all aspects of large, multi-crew jobs; involving multiple moving pieces including 3rd party vendors, rental equipment, processes, budgets, and personnel of up to 50 employees in 8 regions, with 9 sales zones across the United States with upwards of 7-million-dollar revenue.

Huber Ortega



Huber’s areas of expertise are Safety, project management, supervisory skills, and quality control. He provides leadership and mentoring to his crews. Huber also likes fishing and riding his motorcycle. When he is not working or doing his personal hobbies he loves spending time with his family and dogs.

KJ Choi



KJ has an associates in Administration of Justice. He is also a Welding Instruction for classrooms and fields. KJ loves traveling with his wife and fishing.

Eloy Torres



Eloy has worked at natural gas plants all across the country cleaning heat exchangers, hydro-lancing and vessel circulations with various chemical packages. He is safety and Quality oriented with strong supervisory skills. When Eloy is not working he enjoys spending time with his family and friends. He is an avid dirt bike trail rider and loves the outdoors.

Albino Flores



Albino’s areas of expertise include Quality control, supervisory skills, problem solving, and project management. His mission is to provide exceptional customer service. Alhino’s hobbies include building Lord of the Ring miniatures and landscapes and playing Yu-Gi-Oh. Albino also loves spending time with his four sons and grandchildren.

Juan Ariaz



Juan has a bachelor's degree in Business Management and an Associates in Business Administration Applied Science. He is ISO 9001 certified. Juans areas of expertise include Safety & Quality, Leadership skills, and positive public relations. When Juan isn’t working he enjoys spending time with his wife and two daughters, attending his kids sporting events, and riding his motorcycle.

Austin Ratliff



Austin has a background in welding and fabrication. He has extensive knowledge as a diesel mechanic and underground construction. Austin strives working to exceed the expectation of industrial cleaning. In his spare time he likes hunting, fishing, riding his Harley, and floating the river.

Richard DeLeon



Richard is a Service Specialist I in productions enhancement frac/acid, certified LWD Fundamentals Probes, and accomplished pipe layer. He has training in quality assurance and quality control. Richard takes his supervisory skills very seriously. When Richard is not working you can usually find him golfing or barbecuing with his children.

Jose Perez



Jose has an AAS Automotive Technology degree. He has an exceptional track record in maximizing profit potential in a highly competitive environment. He has strong management and supervisory skills. When not working Jose is an avid horseman and loves spending time with his two daughters.

Michael Standifer



Michael has a degree in Business Administration. He has excellent management and supervision skills. One of Michael’s top priorities is to insure quality job completion. His hobbies include managing and welding.

Cesar Castillo



Cesar is a United States Army Veteran. He has 14 years hydroblast experience and 6 years in high capacity Turnaround management. Cesar is also certified as a hydroblasting trainer. In his spare time Cesar like to spend time with his family, work on his personal vehicles, and is the founder of a community outreach non-profit organization.

James Farrell

Client Relationship Manager


James is responsible for ensuring logistics, customer satisfaction and scheduling are all managed day to day. James lives in Yukon, OK with his family. James has been with Sierra since 2014 and is always available for questions. When James is not working, he enjoys spending his time with family and friends. His family and his sons baseball activities are his true passions.


Pam VanDerValde



Pam has been with Sierra Chemicals for 13.5 years. Pam manages Accounts Receivable, Accounts Payable, Payroll, and Accounting functions. Pam has a Bachelor’s degree in Accounting from New Mexico State University and has been working in Accounting for 17 years.

Jamie Higgins

Sales Coordinator


Jamie is a veteran with the USAF. Jamie started working for Sierra in 2020 and is the Sales Coordinator working to assist the Field Service Sales Representatives and Account Managers. She recently moved to Colorado with her husband, two teenagers, and great pyrenees. When Jamie is not working, she enjoys spending time with her family and experiencing all outdoor recreations that Colorado offers.

Janet Ruper

Administrative Assistant


I graduated last year from Fort Lewis College in Durango, Colorado with a bachelor's degree in Business Administration. I am originally from a small town in New Mexico, Peralta. My family and I moved to Durango, Colorado about six years ago. I have four lovely children, of which three of them are young adults. One lives here in Colorado and the other two live in New Mexico. In my spare time, I enjoy baking and spending time with my youngest child, who is 8. We love bike rides, snowboarding, building forts, movie/game nights, and just spending time together.