About Us

We bring experience and efficiency to every project, and we strive to build effective, long-term working relationships. We build a responsive team designed specifically for your needs and focused on your requirements. You will always have a regular and trusted point of contact throughout the complete life cycle of your project.


Baseline’s staff includes professional geologists, professional engineers, and environmental scientists. Read about our expertise and qualifications below.

Bruce Abelli-Amen

Bruce Abelli-Amen
Principal/Technical Director, PG, CHg  

M.S., Geology

Bruce has been with Baseline for over 30 years and is the managing Principal of the firm. He has managed numerous CEQA/NEPA projects (including large infrastructure and mining projects), conducted soil and groundwater quality investigations, and overseen remediation programs. He has extensive experience analyzing and resolving complex water quality and hydrogeologic challenges associated with new development and redevelopment.

William Scott

William Scott
Senior Field Geologist, PG, CHg, CEG
B.S., Geology

Bill has been with Baseline for more than 30 years and has managed field activities for more than 150 groundwater and hazardous waste investigations and remediation projects. He also has performed mitigation monitoring for large-scale construction projects and conducted environmental audits of public and industrial facilities. He has also managed and conducted numerous environmental investigations for soil-gas, soil, and groundwater.


Patrick Sutton
Senior Environmental Engineer, PE
M.S., Civil and Environmental Engineering


Patrick has over 18 years of experience specializing in the assessment, investigation, and remediation of hazardous materials released into the environment. He has prepared numerous air quality and hazardous materials assessments for major transportation, school, and in-fill development projects. His proficiency in a wide range of technical software allows him to thoroughly and efficiently assess and mitigate environmental concerns. 

Cem Atabek

Cem Atabek
Senior Environmental Engineer 

B.S., Environmental Engineering 

Cem Atabek is an Environmental Engineer with over 15 years of environmental consulting experience. He has managed numerous hazardous materials site assessments, investigations, and remediation, including soil gas mitigation. He also has experience conducting CEQA analyses of hazards and hazardous materials, hydrology and water quality, and geology and soils issues for a wide variety of land-use projects.

Yilin Tian-152.jpg

Yilin Tian
Environmental Engineer
PhD, Environmental Science and Engineering

Yilin is as an Environmental Engineer, specializing in air quality, greenhouse gas emissions, and noise analysis. Prior to joining Baseline, she worked as a postdoctoral researcher at University of California, Berkeley for 4 years. Her areas of expertise include air quality, sources and transport of pollutants in the built environment, and human exposure assessment. She is familiar with air pollution models such as CalEEMod and AERMOD, and state/local environmental regulations.