Our Team


Eileen Christensen


Eileen Christensen is the Principal for BEC Environmental, Inc., which she founded in 2002. She has more than 25 years of experience in environmental, health, and safety consulting. During that time, she has served as Project Manager for a variety of environmental projects for local, state, federal, and foreign governments and private industry. Eileen specializes in sustainable community and economic development, focusing on the nexus between brownfields identification, assessment, and reuse; clean energy development; efficient water use; and water quality protection. Eileen works with local residents, governmental leaders, and other stakeholders to identify potential mechanisms to bring their vision for community, growth, and/or revitalization to fruition through advanced planning, funding identification, and project facilitation.

Elizabeth Nelson


Elizabeth Nelson is the CFO for BEC. She has more than 30 years’ experience working in public practice with businesses to enhance profitability. Elizabeth oversees process control, including quality assurance and quality control, and provides training and mentoring for the BEC team.

Richard Nelson, BEC Executive Vice President

Richard Nelson

Executive Vice President

Richard Nelson is a systems management specialist whose talents range from the preparation of critical path schedules to managing multi-disciplinary projects involving planning, construction, general operations, and maintenance. A retired U.S. Air Force officer, Richard’s project experience spans more than 30 years and covers careers in the military, corporate business, and consulting. He is adept at coordinating resource allocation with multiple system interactions. He reviews system needs and identifies resource requirements for each project, schedules deadlines or milestones based on regulatory requirements, and/or resource availability, and works to optimize project performance and reduce timeframe requirements.

Erika Balderson

Senior Environmental Scientist

Erika has more than 15 years of experience in environmental impact analysis, compliance, reporting, and permitting. Working for government agencies and private consulting firms, she has established a strong knowledge base on biological, environmental, and regulatory aspects for a variety of ecosystems and industries. As a certified AHERA Building Inspector and licensed EPA Risk Assessor for lead-based paint, she has participated in asbestos, lead-based paint, and other hazardous materials surveys at locations throughout Nevada. As a Nevada Department of Transportation certified Water Pollution Control Manager, she has conducted water quality assessments and storm water pollution prevention monitoring and reporting in accordance with regional, county, and state regulations. As Project Manager and Field Team Supervisor, she has: conducted sensitive plant and animal population surveys for various state and federal agencies on federal, tribal, state and private lands throughout the southwest; prepared reports in support of field surveys, including environmental impact fatal flaw analysis, Biological Evaluations, Biological Assessments and Environmental Assessments; and reviewed and summarized permitting requirements for multiple project types on state, county, and federal lands

BEC IT Manager Martin Lopez

Martin Lopez

IT Manager

Martin Lopez is BEC’s Information Technology (IT) Manager. His previous experience includes computer technology, along with several independently contracted positions related to computer management and information technology. Martin joined the BEC team in 2009, bringing a wealth of knowledge and technical expertise to the company. He is well-versed in computer systems and network functions and possesses an extensive skill set in the IT field. He works diligently and accurately with a great problem-solving ability to fix issues and ensure functionality.

Danny Rakestraw

Senior Biologist

Danny has more than 25 years of professional experience in the environmental sciences, permitting, and regulatory compliance industry. He has provided technical, management, marketing, and strategic planning support for engineering and environmental consulting firms. His experience includes supporting and managing interdisciplinary teams and projects in the areas of fossil and renewable power generation and transmission; rail, highway and airport facilities; water resources; land development; and federal programs. He has effectively coordinated commercial, state, and federal clients through numerous regulatory processes including Endangered Species Act, Environmental Impact Assessments, and Clean Water Act Section 404.

BEC Senior Biologist Danny Rakestraw
BEC Environmental Scientist Joshua Eastes

Joshua Eastes

Environmental Scientist

Joshua is an Environmental Scientist at BEC. He received his Bachelor of Science in Biology from Butler University and Master of Science in Environmental Science from the University of Colorado Denver. His experience includes socio-economic and environmental research, public outreach and education, Phase II Environmental Site Assessment activities including soil and groundwater sampling, groundwater monitoring, well installation, and vapor intrusion monitoring, and natural resources activities including data collection, field surveys, and technical report development. Josh’s responsibilities at BEC consist of site investigations, and development of Area Wide Plans, Phase I Environmental Site Assessments, Habitat Conservation Plans, Environmental Assessments, Biological Evaluations, Survey Reports, Habitat Assessments, and Biological Constraints Analyses.

Stefanie Costa Rica

Environmental Scientist

Stefanie Costa Rica is a Nevada Certified Environmental Manager and an Environmental Scientist with BEC. She holds a Bachelor of Science in Geology from North Dakota State University. Her 10 years of experience includes Phase I and Phase II Environmental Site Assessments, soil sampling, quarterly groundwater monitoring and sampling, and working with the Nevada Division of Environmental Protection to ensure protection to human health and the environment. Stefanie has also conducted asbestos surveys as a licensed AHERA Building Inspector and Contractor/Supervisor.

Becky Harris, BEC's accountant

Becky Harris

Accounting Manager

Becky is the accounting manager at BEC. She graduated with a Bachelor of Science in Accounting from the University of Nevada Las Vegas, and brings over 17 years of banking, accounting, and managerial experience from retail sales, public accounting, manufacturing, and non-profit organizations to the Team. Becky oversees all areas of finance and administration including payroll, accounts payable and receivables, job costing, cash management, general ledger, inventory, banking, and reconciliations. She also provides strategic analyses for senior management to determine project and company profitability, prepares quarterly financial statements, and develops special reports required by clients. She ensures compliance with small business regulations, tax laws, insurance requirements, industry standards, etc.

Vivian Sam

Environmental Scientist

Vivian is an Environmental Scientist at BEC Environmental, Inc. She received her Master of Science in Biological Sciences with a concentration in Ecology and Evolutionary Biology from the University of Nevada, Las Vegas. Through her graduate education and professional experience, she has over five years of field and laboratory experience in conducting field surveys, managing and analyzing data, and developing technical reports, and presentations. She is experienced in Mojave Desert plant and insect identification. She specializes in biology and desert ecology and her experience includes rare plant surveys, plant/pollinator interaction, effects of wildfire, and desert restoration.

Juan Garcia-Hernandez

Environmental Scientist

Juan is an Environmental Scientist with BEC Environmental, Inc. He received his Bachelor of Science in Environmental Resource Management at the College of Southern Nevada. Juan has over three years of field and lab experience collecting, sampling, and analyzing desert soils as well as conducting small mammal surveys. He has also worked alongside non-profit conservation organizations where he assisted in community outreach, marketing, and project coordination. At BEC, Juan specializes in geographic information systems services through ArcGIS, such as preparing models using geospatial data, developing maps, and field data collection software.

Amberlee Mahaffey

Environmental Scientist

Amberlee Mahaffey is an Environmental Scientist at BEC Environmental, Inc. She has received her Bachelor of Science in Biology-Botany and Master of Biological Sciences in Physiological Ecology from California State Polytechnic University, Pomona. Through her professional experience, she has over nine years of botanical knowledge, teaching and mentoring, data analysis, and field experience in the Southwestern United States including Mojave Desert flora, Coastal Sage scrub, Chaparral, and Sierra Nevada vegetation communities. Amberlee is experienced in environmental research, native plant and noxious weed identification including treatment and monitoring, greenhouse management, habitat assessments, habitat restoration and reclamation practices, quality assurance/quality control compliance protocols, and science interpretation for public outreach.

Giavanna Fernandez

Environmental Scientist

Giavanna is an Environmental Scientist for BEC Environmental, Inc. She has received a Bachelor of Science in Environmental Management from the College of Southern Nevada. Giavanna has three years of field and lab experience in collecting, sampling, and analyzing desert soils as well as conducting small mammal surveys. She has one year of experience in environmental consulting, site characterization and assessments, environmental sampling such as soil, air, and groundwater, and conducting Phase I ESAs throughout the Las Vegas Valley. Giavanna has also conducted asbestos surveys as a certified licensed AHERA asbestos building inspector and contractor supervisor, and is an EPA Lead-Based Paint Inspector for the State of Nevada.