Operations Staff

A photo of 12 people in uniforms and clothing with San Mateo County Mosquito and Vector Control branding. The people are standing in front of a tan wall and all looking at the camera.

Operation Staff consists of 10 Vector Control Technicians, a Supervisor, and a Director. All staff are certified by the California Department of State Health Services as Public Health Vector Control Certified Technicians. All staff maintain an active certification, which includes continuing education units and regular training.

Vector Control Technicians, by area served:

City	Technician
Atherton	Evan Ostermann
Belmont	Stephanie Busam
Brisbane	Eric Eckstein
Burlingame	Justin Loman
Colma	Walter Bruj
Daly City	Walter Bruj
East Palo Alto	Evan Ostermann
Foster City	Vanessa Hernandez Pacheco
Half Moon Bay	Walter Bruj
Hillsborough	Justin Loman/David Allen
La Honda	Kim Keyser
Loma Mar	Walter Bruj
Menlo Park	Evan Ostermann/Kim Keyser
Millbrae	Eric Eckstein
Pacifica	Walter Bruj
Pescadero	Walter Bruj
Portola Valley	Kim Keyser
Redwood City	Devon MacDonald
Redwood Shores	Stephanie Busam
San Bruno	Eric Eckstein
San Carlos	Stephanie Busam
San Gregorio	Walter Bruj
San Mateo	David Allen/Vanessa Hernandez Pacheco
South San Francisco	Eric Eckstein
Woodside	Kim Keyser

Casey Stevenson

Position: Operations Director
Phone: 650-344-8592

Casey began his career with San Mateo Mosquito and Vector Control District in 2008 as a seasonal Vector Control Aide. Later that year he was hired as…

Ryan Thorndike

Position: Field Operations Supervisor

Ryan Thorndike started with the District in 2014 as a seasonal employee helping to eradicate the Aedes aegypti mosquito (also known as the Yellow…

David Allen

Position: Vector Control Technician

David holds a Bachelor of Arts in Environmental Science and an Associate of Arts in Wildlife Management. Before joining the District in 2012, David…

Stephanie Busam

Position: Vector Control Technician

Stephanie Busam has worked at San Mateo County Mosquito and Vector Control District as a Vector Control Technician since January 2005.

Walter Bruj

Position: Vector Control Technician

A Bay Area native, Walter began his career with the District in the spring of 2015 as a Vector Control Aide II working with the Aedes aegypti team. He…

Eric Eckstein

Position: Vector Control Technician

Eric has worked for the District since 2014, first as a seasonal Vector Control Technician before being hired for a permanent position. He has a…

Vanessa Hernandez Pacheco

Position: Vector Control Technician

Vanessa has a Bachelor of Science in Molecular, Cell and Development Biology from the University of Santa Cruz. After graduating from college, Vanessa…

Sean Jones

Position: Mechanic/Vector Control Technician

Sean worked for the District as a seasonal Vector Control Aide in 2015. He joined the staff as a permanent employee in October 2015 providing service…

Kim Keyser

Position: Vector Control Technician

Kim has worked with San Mateo County Mosquito and Vector Control District since 2004. She studied entomology and acarology in university and has…

Justin Loman

Position: Vector Control Technician

Justin has worked for San Mateo County Mosquito and Vector Control since 2016. He started with the District as a lab summer intern when he was a…

Devon MacDonald

Position: Vector Control Technician

Devon worked for the District as a Seasonal Vector Control Aide during the 2016, 2017, and 2018 seasons. He joined the District staff as a permanent…

Evan Ostermann

Position: Vector Control Technician

Evan started with the District as a Seasonal Vector Control Aide in the Summer of 2018. At the end of the season he was hired full-time as a Vector…

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