Bill loves to build bridges - over water and with people. Bill is the Principal Engineer at NextGen Engineering. Founded in 2012, NextGen specializes in water resources and Civil engineering. NextGen participates in local and international workshops and training, including facilitating a Fundamentals of Engineering exam preparation course with University of Arizona's Continuing Education. Bill has over 30 years of professional experience in engineering, watershed planning, training, and design for water infrastructure.
Bill and his family lived and worked in the Middle East for over a decade. He also participated in Water supply, Sanitation and Hygiene (WASH) training in Ethiopia and Central Asia. Bill is an active volunteer in the Tucson international and refugee-serving community.
Mr. Wan is a Tucson native, who has dedicated his life to understanding and serving his community. Mr. Wan serves as Planner/Project Manager at NextGen Engineering, managing water and wastewater system, residential and commercial projects, and watershed management projects in Southern Arizona for public and private clients. Multicultural and bilingual in Spanish, he is passionate in supporting environmental and economic development along the Arizona/Mexico Borderlands communities.
Mr. Wan is experienced managing local, regional, and federal projects and is proficient in GIS.
Mr. Wan serves on the Boards of Friends of Planning (FOP) and Tucson Residents for Responsive Government (TRRG) and is active with the American Planning Association (APA). He enjoys nature with his wife and dog, taking time to appreciate the simple things.
Sarina Martinez moved to Tucson from Los Angeles, California in 2000. She is a registered Professional Engineer (PE) with a BS in Civil Engineering and an MBA from The University of Arizona. Sarina has primarily worked in land development, focusing on surface and groundwater hydrology design. She is also skilled in open pit and ISR recovery mining where she specializes in reclamation and environmental engineering. With a family background in construction from her father, Sarina became a licensed contractor and took over for her father’s construction company where she works on residential and commercial projects. Sarina is excited to be part of the NextGen team. She hopes to develop her Auto CAD designing skills as Associate Engineer here at NextGen Engineering working along the “Next Generation” of Civil Engineers. With her vast background in environmental compliance, construction, and project management she brings a lot to our team. Sarina and her husband have two boys, a cat, and a dog. She uses her free time volunteering at the Tucson Unified School District with the audit committee and PTA as well as being president of her community HOA.
Dr. Erfan Tousi is from the middle east, born and raised in Iran, with a PhD in Water Resources Engineering from the University of Arizona. He is passionate about finding ways for modeling natural systems more realistically through hydraulic and hydrological modeling. Erfan has been with NextGen Engineering as an intern for over 10 months, and now he is a full time Associate Water Resource Engineer. He is responsible for some of our highly detailed Model and Research rich projects here at NextGen Engineering. Dr. Tousi is a skilled Hydraulic and Hydrological (H&H) modeler, also skilled in Machine Learning (ML) techniques. He is passionate about how ML techniques can be employed in modeling water systems. He brings a fresh perspective while working on H&H projects which mostly contain correcting and updating FEMA flood maps. Dr. Tousi has worked with two Master Civil Engineers and NextGen president, Bill O’Brien (PE, CFM, QSD), on a research paper under review of one of the best scientific journals in the area. The paper brings to light the impact of climate change on the infrastructure design in Tucson. Erfan plans on continuing his research while working full time with Nextgen Engineering.
Garrett has four years professional experience with NextGen. While he spends most of his time at the California project office, he is a vital part to our main office in Tucson. Garrett is passionate about the role that Hydrology plays in the future of increased clean water scarcity. He is driven to find unique solutions related to managing natural resources in an effective and responsible way.
Tariq recently became a full-time staff member at NextGen after his graduation with a degree in Civil Engineering from the University of Arizona. Previously, Tariq served as a NextGen intern for three years supporting NextGen’s Fundamentals of Engineering (FE) class at Arizona. As an intern he provided research support to various NextGen projects and has since become an experienced Civil Infrastructure designer. Born and raised in Baghdad, Iraq, Tariq came to Tucson as a refugee with his family 11 years ago. Tariq is passionate about serving vulnerable, under-represented communities and bringing insight into how to make those communities safer in a modernizing world.
Jayson joined NextGen at the beginning of 2020 and serves as the firm’s Field Inspector where NextGen provides construction oversight support; observing, documenting, and photographing SWPPP and construction activity requirements tailored to each job.
Jayson is an 8th generation Tucsonan who has served his country in the Army during the 90’s, and his community in the past as an EMT in the Emergency Medical field for 10 years beginning in 2000. Nearing the end of that decade, he began voluntarily serving the refugee community during the country’s financial crisis helping to relocate and move families in need and helping them find jobs. His computer electronics and optics studies brought him into freelancing business computer servers, POS systems, and AP mapping and installations in Tucson and throughout Oregon before working for NextGen Engineering.
Raised in Denver Colorado Fred moved to California in 1983. With over 34 years experience in drafting, Fred’s knowledge is immense, and he brings a lot to the table for NextGen. Fred has been with NextGen for the past 6 years as a CAD Designer and Drafter. He is passionate about being involved in the foster care system and he enjoys volunteering as a CASA (court appointed special advocate). He is experienced in using AutoCAD, AutoCAD Civil 3d, MicroStation, and Traffix software packages.
Originally from Tucson, Richard began his career conducting economic impact assessments of proposed regulations for the US Environmental Protection Agency (EPA). Later in his career, as CEO of an Environmental Engineering Company, Richard made several acquisitions, three of which were in Canada. Richard also spent time in the U.S Air Force and the Air National Guard and retired with the rank of Colonel. He carries over 40 years of professional and business management experience that make him a key member of the NextGen team.