Operations Staff


Meet Your Technician

The San Mateo County Mosquito and Vector Control District staff consists of certified vector control technicians and other professionals who are dedicated to safeguarding the health and comfort of the residents of San Mateo County.

To to learn more about your city’s Vector Control Technician, please click on their name.

Our Vector Control Technicians

City Technician
Atherton Stephanie Busam
Belmont Walter Bruj
Brisbane Kim Keyser
Burlingame Sean Jones
Colma Kim Keyser 
Daly City David Allen
E. Palo Alto Stephanie Busam 
Foster City Walter Bruj
Half Moon Bay David Allen
Hillsborough Sean Jones 
Menlo Park Stephanie Busam
Millbrae Kim Keyser
Pacifica David Allen
Portola Valley Jim O’Brien
Redwood City Ryan Thorndike
Redwood Shores Eric Eckstein
San Bruno Kim Keyser 
San Carlos Eric Eckstein
San Mateo Hector Cardenas
South San Francisco Kim Keyser 
Woodside Jim O’Brien
Field Operations Supervisor Casey Stevenson walks through tall grass wearing a backpack sprayer.

Casey Stevenson
Field Operations Supervisor

About Casey:

A District native, Casey began his career with San Mateo Mosquito and Vector Control District in 2008 as a seasonal Vector Control Technician. Later that year he was hired as a permanent Vector Control Technician and subsequently promoted to his current position as Field Operations Supervisor. Casey is a graduate of California State University Chico, where he received a Bachelors degree in communications.

Vector Control Technician drives a red amphibious vehicle through a flooded marsh.

David Allen
Vector Control Technician

About David:

David holds a Bachelor of Arts in Environmental Science and an Associate of Arts in Wildlife Management. Before joining the District in 2012, David owned a snake removal and consultation company which he operated in Northern California and Arizona.  David’s other professional experience includes herpetological conservation projects in South Africa, primate linguistics research, public education, and wildlife/natural resource management.

Vector Control Technician Stephanie Busam wades through a flooded forest wearing the District uniform and holding a yellow hose.

Stephanie Busam
Vector Control Technician

About Stephanie:

Stephanie Busam has worked at San Mateo County Mosquito and Vector Control District as a Vector Control Technician since January 2005. While she has covered a variety of zones in the county, she is currently working in East Palo Alto, Menlo Park, Atherton

A portrait of Vector Control Technician Walter Bruj wearing the District uniform.

Walter Bruj
Vector Control Technician

About Walter:

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 was hired on as a permanent Vector Control Technician in October 2015.

Walter’s public sector background includes several years with the Alameda County Agriculture Pest Detection Program and as a park ranger with San Mateo County Parks. In the private sector he worked in video production/multi-media, and he has extensive marine-related experience.

A portrait of Vector Control Technician Hector Cardenas wearing the District uniform standing in front of a large map.

Hector Cardenas
Vector Control Technician

About Hector:

Hector started with San Mateo County Mosquito & Vector Control District in 2009 as summer help treating catch basins around the county. In December 2012 Hector was hired as a Vector Control Technician. Prior to working in vector control, he worked as an EMT.

Hector is currently the technician for San Mateo. Current problems for San Mateo are underground sources like sewer drains and water underneath residential homes.

Vector Control Technician Eric Eckstein wades through a flooded forest dragging a yellow hose.

Eric Eckstein
Vector Control Technician

About Eric:

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 Bachelor of Science in Microbiology from San Francisco State University, and worked in environmental microbiology before joining the District staff.

Eric is a native of San Mateo County, and a die-hard 49ers fan.

A portrait of Vector Control Technician Sean Jones wearing the District unfiorm

Sean Jones
Vector Control Technician

About Sean:

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 in Burlingame and Hillsborough. Sean is a lifelong resident of San Mateo County.

Contact Information:

Office: (650) 344-8592 x16

Fax: (650) 344-3843

Email Sean.

Vector Control Technician Kim Keyser walks through a meadow on a sunny day carrying a dipper.

Kim Keyser
Vector Control Technician

About Kim:

Kim has worked with San Mateo County Mosquito and Vector Control District since 2004. She studied entomology and acarology in university and has worked in that field for Archbold Biological Station in Florida and San Mateo County Department of Agriculture/Weights and Measures in California.

A portrait of Vector Control Technician Jim O'Brien wearing the District uniform.

Jim O’Brien
Vector Control Technician

About Jim:

Jim has worked for the District since 1999 as a Vector Control Technician. His zone includes Woodside and Portola Valley. His professional interests include vertebrate biology.

Vector Control Technician Ryan Thorndike kneels in a marsh wearing the District uniform and holding a dipper.

Ryan Thorndike
Vector Control Technician

About Ryan:

Ryan Thorndike started with the District in May of 2014 as a seasonal employee helping to eradicate the Aedes aegypti mosquito (also known as the Yellow Fever mosquito) in West Menlo Park.  His strong background in working with the public made him a valuable member of the SMCMVCD team and has since been promoted to a full-time vector control tech.  His zone includes Redwood City, in which he inspects and treats known sources of vectors.  His ultimate goal is to improve the quality of life for citizens of San Mateo County, the county in which h