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Executive Management

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Barbara Romero
Director and General Manager

A native Angelena born and raised in East Los Angeles and Boyle Heights, Barbara Romero was appointed Deputy Mayor of City Services by Los Angeles Mayor Eric Garcetti in March 2015. In this role, she ensures that the mayor’s priorities are implemented by 15 departments representing thousands of workers and more than $5 billion in annual budgets, including Aging, Animal Services, Cultural Affairs, Disability, the El Pueblo Historical Monument, the Library, Public Works (Bureaus of Contract Administration, Engineering, Sanitation, Street Lighting, and Street Services), Recreation and Parks, Transportation, Water and Power, the Zoo, and their associated boards and commissions. She also facilitates implementation of projects and programs related to the mayor’s work at Metro and the Metropolitan Water District and via mayoral executive directives, notably focused on sustainability, climate change response, equity, and youth sports in preparation for the 2028 Olympic and Paralympic Games in Los Angeles. Some of her notable environmental achievements in the Garcetti Administration include establishing/co-leading the Mayoral Water Cabinet, facilitating the City’s acquisition of the Taylor Yard G2 parcel for $60 million, ensuring $465 million was included in Measure M for completion of the LA River trail system in the San Fernando Valley and through Downtown LA, and leading the City’s efforts in support of the passage of County Measures A (parks) and W (stormwater).  To implement Measure W (the Safe, Clean Water Program), she co-chairs the Countywide Regional Oversight Committee. Prior to her service as deputy mayor, Mayor Garcetti appointed her to serve as a commissioner on the City’s Board of Public Works overseeing the Bureau of Sanitation. 


In the previous mayoral administration, Romero served as a City Planning Commissioner, appointed by then-Mayor Antonio Villaraigosa. She spent a decade working for the Mountains Recreation and Conservation Authority (MRCA) as its Chief of Urban Projects and Watershed Planning. There, she served as liaison to local, state, and federal legislators on park planning issues, helped craft park legislation and funding strategies, and managed millions of dollars in urban park projects. Her particular focus was on identifying, developing and implementing multifaceted open space acquisition, restoration, and recreation projects in historically-underserved neighborhoods along the Los Angeles River and its tributaries. Through her work at the MRCA, she was a key contributor to the Los Angeles River Revitalization Master Plan, which was adopted by the Los Angeles City Council in 2007.


Early in her career, she worked as a community organizer for the Roosevelt High School Healthy Start Program. She also worked for the Los Angeles Conservation Corps running a federal AmeriCorps jobs program in East Los Angeles. Romero has always been involved in community service; she founded the Girls Today, Women Tomorrow Leadership Mentoring Program, previously served on the boards of the Los Angeles River Revitalization Corporation (now River LA), the Baldwin Hills Conservancy, Los Amigos Council for Para Los Niños, Valley Presbyterian Hospital, and Community Nature Connection. She now serves on the Boards of the Los Angeles Conservation Corps and the Hollywood Sign Trust. 


In recognition of her work, Romero received the “Outstanding Young Californian Award” from the California Junior Chamber of Commerce Foundation, the “Aztec Award” from the Mexican American Opportunity Foundation, the “Environmental Justice Civic Leadership Award” from Pacoima Beautiful, “Las Mujeres Award” from Lot to Spot, the “La Adelita” Award from Mujeres de la Tierra, and, in 2017, the “Muxer of the Year Award” from Las Fotos Project and the “Nuevo Amanecer Mujer integral dia Internacional de la Mujer Award” from Avanca.


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Traci J. Minamide, P.E., B.C.E.E.
Chief Operating Officer
Traci assists the Director in LASAN’s activities with an emphasis on wastewater treatment and water reclamation. She has been with the City for over 25 years serving in many capacities including water planning, industrial pretreatment, environmental regulations, wastewater treatment, biosolids and water reclamation.

Traci holds a Bachelor of Science degree in Civil Engineering from California State Polytechnic University at Pomona, a Master of Science degree in Environmental Engineering from Loyola Marymount University and certification in Executive Management for State and Local Government from Harvard University. She is also a licensed professional civil engineer in the State of California and a Board Certified Environmental Engineer through the American Academy of Environmental Engineers and Scientists. She serves on the Board of Directors for the California Association of Sanitation Agencies (CASA) and the State’s Advisory Panel on Direct Potable Reuse.
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Lisa B. Mowery, P.E.
Chief Financial Officer
During her 24 years with the City of Los Angeles, Lisa has worked as a project manager and environmental compliance specialist. During the past 16 years, she has been involved in the issuance of over $4 billion in bonds for the City's Wastewater Program. Lisa also specializes in rate-setting and led an effort for the wastewater program resulting in the adoption of sustainable wastewater fees for a ten-year period.  She currently manages LA Sanitation’s financial programs, totaling more than $1 billion in annual revenues. She has a Bachelor of Science degree in Civil Engineering from Purdue University and is a Registered Civil Engineer in California. She currently manages LASAN's administration and financial programs.
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Mas Dojiri, Ph.D., B.C.E.S.
Assistant Director
Mas oversees the Technical Services Divisions, which is comprised of Environmental Monitoring, Industrial Waste Management, Regulatory Affairs, Information Control Systems, and Industrial Safety Compliance Divisions. He is also designated as the Chief Scientific Officer for LA Sanitation and serves as a member of the Board of Governors and the Joint Strategic Advisory Team of the Southern California Coastal Ocean Observing System (SCCOOS). He also serves as the Vice-chair of the Technical Advisory Committee of the Santa Monica Bay Restoration Commission, and served as both the Chair and Vice-chair of the Board of Commissioners for the Southern California Coastal Waters Research Project.  Mas is also currently the Chair of the Environmental Biology subcommittee of the American Academy of Environmental Engineers and Scientists and was instrumental in creating the national Board Certification for Environmental Scientists.  Mas received his BA from UC Santa Barbara, his MA from California State University, Long Beach, and his PhD from Boston University.  He completed his postdoctoral fellowship at the National Museum of Natural History, Smithsonian Institution and is the author of 38 peer-reviewed scientific publications and two technical books on crustaceans.
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Alex E. Helou, Ch.E.
Assistant Director
Alex heads the Solid Resources Group that is responsible for managing solid waste for the entire City of Los Angeles, including collection, transport, and processing of source separated recyclables, green materials, and municipal solid waste from 750,000 residential customers. Alex leads a workforce of over 1,300 employees in five Divisions, with an annual operating budget of over $180 million. He is in charge of implementing many key solid waste management strategies to help the City of Los Angeles achieve Zero Waste by 2025, including the Solid Waste Integrated Resources Plan and the Commercial Franchise System. The City has exceeded the 75% diversion rate and continues moving toward the zero waste goal. A 22-year veteran of the City of Los Angeles, Alex is a registered Chemical Engineer with a Master's degree in Environmental Engineering
Jose "Pepe" Garcia
Assistant Director

Jose “Pepe” Garcia serves as the Assistant Director of Solid Resources Operations.

Pepe began his 30-year career with LASAN as a Refuse Collection Truck Operator in the West Los Angeles Yard. He has worked as a Crew Instructor, Supervisor in Safety and Training, Alternative Fuel Program, and Container Replacement, Superintendent at Customer Care and North Central and Solid Resources Manager at Clean Streets LA.

Most recently, Pepe was in charge of the Solid Resources Collection Divisions.

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Timeyin Dafeta, P.E.
Executive Hyperion Plant Manager
Tim is the Plant Manager of the City of Los Angeles Hyperion Water Reclamation Plant
Hyperion is one of the largest plants in the world with an annual operating budget of over $80 million, annual capital budget of over $40 million, and staff of 372 employees of all trades and professional classes.

During his 29 years with the City of Los Angeles, he has worked in process engineering, capital projects planning, industrial pretreatment, environmental regulations, wastewater treatment, and biosolids management. Tim is a licensed civil engineer with the State of California and has a Master’s degree in Applied Math.