Paving The Path Forward

Our leadership team takes pride in promoting the highest quality of work while upholding strong safety standards that carry out to the job site.

Our team is passionate about our safety practices and the work that we perform. Together, our team is helping keep the community safe. Interested in learning more about our services? Contact us today to find out how we can meet your needs.

Richard John Mowbray


Richard Mowbray, grandson to John and Gloria Mowbray and son to Rick and Denise Mowbray, is the third generation of the Mowbray family to lead Mowbray’s Tree Service. Richard, started his career in the Utility Vegetation Management (UVM) industry in 2005 as a groundman and worked his way up to CEO by working just about every position within Mowbray’s. This included crew foreman, hazardous tree removal specialist, crane operator and, in 2019, Corporate Safety director. 

During this time Richard has worked with utility companies in California and Arizona performing vegetation management and also the various wildfire projects throughout California. These utilities include the following:

  • Southern California Edison (SCE)
  • Pacific Gas and Electric (PG&E)
  • Sacramento Municipal Utility District (SMUD)
  • Arizona Public Service (APS)
  • Pacific Power and Light (PPL)
  • Add Bear Valley Electric Service (BVES)



Provide support for client and regulatory interface and ensure the operating units within MTS have the required support and guidance to continue to drive MTS to “Best in Class”.



  • ISA Certified Arborist
  • ISA Qualified Tree Risk Assessor
  • TCIA Certified Tree Safety Professional
  • CA Contractors License C61/D49
  • NCCCO Certified Crane Operator
  • Licensed Timber Operator

Mike Bartelli

Sr. Vice President of Operations

Michael Bartelli is a seasoned industry professional and Certified Arborist with over 25 years of experience in Utility Vegetation Management. He joined the Mowbray team in 1991 and has been actively involved in the operations of Utility Vegetation Management as a General Foreman, General Manager, Project Manager, Area Manager, and most recently as the Sr. Vice President of Operations. During his tenure at Mowbray’s, Michael Bartelli has conducted and supervised vegetation management for utility companies to include:

  • Southern California Edison (SCE)
  • Pacific Gas and Electric (PG&E)
  • Arizona Public Services (APS)
  • Duke Energy
  • PacifiCorp


As the Sr. VP of Operations, Michael Bartelli oversees the day-to-day operations of the company, defines and implements operation strategies, structures, and processes. He is also responsible for managing the quarterly and annual budget process, and monitor performance to proactively identify efficiency issues and propose solutions.

Marcos Rodriguez

Director of Operations PG&E Division

Marcos Rodriguez began his arboricultural career in 2004 as a groundman. With his attention to detail and passion for the industry he rose through the ranks to become a General Foreman and ISA Certified Arborist in 2007, In 2013 Marcos joined the Mowbray team as a General Foreman and in 2016 was promoted to Northwestern Region Manager where he oversaw a team of over 100 Line Clearance Arborists in the state of Oregon.

During his time at Mowbray’s, Marcos has been involved in projects with different utility companies including:

  • Arizona Public Service (APS)
  • Pacific Gas and Electric (PG&E)

In 2020, Marcos was promoted to Director of Operations for the PG&E Division.


Oversees state-wide operations for the PG&E Division to include routine, storm, fire, and emergency projects. Coordinates mobilization and placement of equipment and crews.

Axel Avila

Safety Director

After working in Adventure Tourism for 8 years, Axel Avila began his arborist career in 2006 when he moved to Puerto Rico. During the following 12 years his passion and knowledge for the industry grew as he conducted tree care and maintenance across Puerto Rico, Mexico, and the United States.

In 2011 Axel Avila founded Senda Vertical, a company focused on propagating safe practices and best methods to the growing tree industry in Mexico. In 2014 Axel returned to the United States and began his training as a Safety Instructor in the State of Colorado.

Axel Avila joined the Mowbray’s team in 2019 as a Trainer and has worked diligently to support Mowbrays Safety Program. In 2020 Axel became the Safety Director for Mowbray Tree Service where he continues to work towards the advancement of the safety culture. 


Responsible for overseeing Mowbrays Tree Service’s Safety Program. Manages all safety communication to safety and training personnel. Develops, reviews, and implements safety policies to coordinate and evaluate safety efforts. Generates and manages the corporate Safety and Training budget. 


Some of Axel Avila’s achievements include: 

  • ISA Certified Arborist
  • ISA Certified Utility Specialist
  • ISA and Mexican Association of Arboriculture (AMA) guest speaker.
  • TCIA Crane Operations Specialist
  • TCIA SRT Climber
  • TCC winner of the Rocky Mountain Chapter. July 2016

Holly Palmer

Billing Director

Holly joined the Mowbray’s team in 2017 as an invoicing associate. Her attention to detail, exceptional organizational skills, and ability to communicate and coordinate with Utility Representatives and other members of the billing department led her to a management position within her first year at Mowbrays.  In her new management role, Holly successfully re-structured the billing operations for Mowbrays SCE Division making it more efficient and manageable. The systems she implemented in the SCE Division’s Billing Department were so successful that it became clear other departments needed to adopt some of her ideas and processes. In 2020, Holly was appointed Billing Director for all Utility Contracts to include:

  • Southern California Edison (SCE)
  • Pacific Gas and Electric (PG&E)
  • Sacramento Municipal Utility District (SMUD)
  • Bear Valley Electric Service (BVES)
  • Liberty Utilities


Oversees company invoicing operations to achieve compliance and weekly invoicing goals. Coordinates invoicing operations with Department Managers and District Coordinators. Monitors work release, tracking and completion of work points.

Karen Jimenez

Payroll Administrator

Karen Jimenez joined Mowbray’s Tree Service in 2015 as a payroll associate with over 10 years of experience in Administrative and Customer Service functions. Karen’s ability to manage the payroll for Mowbray’s ever-growing workforce, implement new payroll laws, and her exceptional coordination efforts with Human Resources earned her the position of Payroll Administrator in 2019. In this new roll, Karen has been instrumental in transitioning Mowbray’s payroll department into the digital era by implementing digital time records and ADP payroll systems. Karen and her team ensure that Mowbrays payroll department complies with all Union contracts, and all inquiries are resolved.


Ensure Mowbray’s Payroll complies will all local, State, and federal Labor Laws. Oversee the payroll department to ensure timeliness and accuracy. Coordinate with Human Resources to update the system for employee changes. Verify Mowbray’s Payroll compliance with Union Contracts.


Associate degree in Biology – San Bernardino Valley College.

Associate degree in Physical Sciences – San Bernardino Valley College.

Certified by The American Payroll Association in their Fundamental Payroll Certification.

Robin Mowbray

Corporate Secretary/ WMBE Certified

Robin Mowbray is the daughter of John and Gloria Mowbray, and now second-generation Mowbray family member to oversee Mowbray’s Tree Service. Robin started her career in 1993 in administration while Mowbray’s was growing in the Utility Vegetation Management sector.

Robin has been instrumental in the structural growth of administration functionality including Payroll, Insurance, Union, and all compliance retention. During this time Mowbray’s has grown from 100 employees to over 1,500 full time employees. Robin is an excellent listener and communicator with abundance of patience and enthusiasm. She meticulously guides employees and supporting agencies through all Mowbray’s business processes.


  • Provide guidance and support for all administration and regulatory compliance.
  • Oversee all human resources, payroll, finance, and reporting.
  • Provide strategic counsel and continue focus on women-owned, family-operated business in daily and future opportunities.


20+ years of applied multi-utility tree service administration.

10+ years as corporate executive.

Learn More About Us

About Us
Leadership Team
FERC Compliance

Let’s Work Together

Interested in learning more about our services and how we can help? We want to hear from you! Fill out the form below and a representative from our team will be in contact with you shortly.

We want to hear from you!

Our representatives are happy to answer any questions you may have.

Visit Us

686 E Mill St.
San Bernardino, CA 92408

Call Us

(909) 389-0077