About Underwood & Rosenblum, Inc.


Mark Sorenson, PE,QSD
Senior Civil Engineer

Expertise and Experience:
Mark Sorenson brings more than 23 years of experience in civil engineering design. He has a diverse background with experience in public and private school facility design, high tech commercial development projects, federal financed projects, roadway design with Caltrans requirements and local jurisdiction needs. Responsibilities include project planning, conceptual design, hydraulic studies, traffic designs, grading and improvement design, plans and specification preparation for public roadway design. Mr. Sorenson is trained in Green Building Code practices, CHP points and is a Qualified SWPPP Developer (QSD). He is familiar with all Bay Area regional stormwater requirements.
  • Education: B.S. Civil Engineering, Cal Poly State University, Pomona
  • Licensure: California Professional Civil Engineer No. C67498
  • Qualified SWPPP Developer No. 23084

Teodoro "Theo" Martinez, PLS
Professional Land Surveyor

Expertise and Experience:
Mr. Martinez has over ten years of land surveying experience working with Underwood & Rosenblum, Inc. He is part of an elite group of surveyors (including Frank Rosenblum), having passed all three of his examinations for professional licensure on the first attempt. His areas of expertise include boundary resolution, subdivision mapping, lot line adjustments, ALTA surveys, and condominium plans. He also has extensive experience as a party chief for topographic surveys and construction staking. His normal survey duties include boundary resolution, mapping, condominium plans, AutoCAD drafting, quality control, and staff training. Mr. Martinez is also active in the California Land Surveyors’ Association. He often coordinates and participates in events promoting the profession of Land Surveying.
  • Education: B.S. CSU Sacramento, CA
  • Licensure: California Professional Land Surveyor No. 8849