Danielle Mui Mark

Technical Leader | Gas Decarbonization
San Francisco Bay Area linkedin.com/in/danielle-mark

Professional Overview

Professional Engineer with 15+ years in natural gas infrastructure, leading R&D and technology programs from concept to deployment readiness across hydrogen, RNG, carbon management and asset traceability. Leads hydrogen strategy for pipeline transport, turning complex technical, safety and regulatory requirements into feasibility assessments, roadmaps and awareness training that help operators evaluate hydrogen and other low-carbon gases. Technical witness in a first-of-its-kind CPUC proceeding for a utility-scale hydrogen blending demonstration (decision pending), with a record of building research and vendor partnerships and managing multi-million-dollar programs and portfolios.

At a Glance

15+ years
in natural gas engineering, operations, R&D and program leadership
50,000 miles
of pipeline system guided on hydrogen blending strategy
1,000+
employees reached by PG&E's first hydrogen blending training
$5M
R&D portfolio spanning 25+ decarbonization projects
27+
research and vendor partners (12 research organizations, 15+ vendors)
2,000+
personnel using the emergency response process I designed

Skills

Technical Expertise

  • Emerging gas decarbonization (hydrogen, RNG, CCUS)
  • Hydrogen blending feasibility & safety assessment
  • GHG emissions analysis
  • Pipeline integrity & gas system operations
  • Risk assessment & failure analysis
  • Fluid mechanics & thermodynamics

Program & Project Management

  • Technical program management
  • Technology roadmapping & portfolio management
  • R&D program leadership
  • Enterprise implementation & change management
  • Vendor & research partnerships
  • Budget management ($2M+ program, $5M R&D portfolio)

Strategy, Regulatory & Communication

  • Regulatory compliance (CPUC, CARB, CFR)
  • Expert witness testimony
  • Policy engagement (CHBC committee)
  • Business case development
  • Training development & delivery
  • Cross-functional stakeholder alignment

Work Experience

PACIFIC GAS & ELECTRIC COMPANY (PG&E)
Expert Engineer, GHG Emission Strategies
2022 - Present
  • Serve as technical witness in the CPUC proceeding for California's first utility-scale gas transmission hydrogen blending demonstration, presenting its technical feasibility, safety and prudence (decision pending).
  • Direct technical strategy for hydrogen blending across a 50,000-mile natural gas pipeline system, guiding feasibility assessment and infrastructure readiness planning.
  • Developed and delivered PG&E's first "Hydrogen Blending 101" training to 1,000+ employees, building company-wide awareness of hydrogen's carbon reduction potential, system impacts and PG&E's current readiness.
  • Served as interim manager of a 5-person team (2.5 months, 2024), documenting key processes, balancing workload and ensuring a smooth leadership transition.
Principal Hydrogen Program Manager (1-year rotation)
Feb 2026 - Feb 2027
  • Develop enterprise hydrogen transport strategy, informing pipeline planning with anticipated production methods and the customers pipelines would serve.
  • Serve on a California Hydrogen Business Council (CHBC) committee, providing input on hydrogen policy.
Senior Engineer, R&D and Innovation
2018 - 2022
  • Led 25+ hydrogen, RNG and carbon management R&D projects to completion across a $5M portfolio, partnering with 12 global research organizations (Sandia, PRCI, etc.) and 15+ technology vendors.
  • Established gas decarbonization expertise at PG&E in a new R&D area, developing whitepapers and technical analyses published on PG&E's public biomethane webpage.
  • Led the 2020 PRCI hydrogen state-of-the-art study team, coordinating a consulting contractor and member companies worldwide to document the state of knowledge, gaps and research needed for hydrogen blending.
  • Evaluated the technical merit and business value of emerging decarbonization technologies, presenting business cases to senior management to justify supporting their development.
  • Authored a 10-year technology roadmap defining ~$2M/yr of R&D investment across hydrogen, RNG and carbon capture, aligned with California's 2045 carbon neutrality target.
  • Mentored a summer intern (2020) and a career-level engineer (from 2021) on the decarbonization R&D portfolio.
Gas Engineer, R&D and Innovation
2016 - 2018
  • Led a $2M+ asset traceability program from inception through field pilot to deployment readiness, partnering with a 5-engineer vendor team to develop software capturing high-accuracy GPS coordinates and material specifications of newly installed gas assets, enabling 100% traceability and stronger data integrity.
  • Formed and led a cross-functional team across lines of business, including union representatives, to prepare internal processes for company-wide adoption of the asset traceability program, managing scope, cost, schedule, technology and procurement risks.
  • Resolved a critical-path barrier to the asset traceability program's deployment by partnering with manufacturers to make ASTM F2897 barcodes on plastic gas assets reliably readable.
  • Drove compliance with a new asset encoding standard across 6 OEM partners, enabling digital asset management for all gas distribution pipeline components.
Operations Engineer, Gas Control Center
2014 - 2016
  • Designed and implemented a gas distribution emergency response process, adopted by 2,000+ personnel, that positions the Gas Control Center to provide system-wide situational awareness and coordinate plans to resolve emergencies.
  • Drove adoption of the emergency response process through cross-functional consensus building, new company standards and procedures, web-based training, and in-person roadshows at company yards.
  • Applied operational incident analysis to identify systemic risks and communicated lessons learned to Gas Control personnel, driving safety improvements.
ENBRIDGE GAS DISTRIBUTION
Senior Engineering Project Leader, Construction and Operations
2013 - 2014
  • Justified a $0.5M capital investment in hydrovac excavation equipment through an executive business case, delivering $1M+ in annual O&M savings.
  • Supervised 10-person contractor crews during high-pressure pipeline construction, ensuring safe and efficient execution.
  • Developed an algorithm, grounded in fluid mechanics, to calculate odorant concentration in a pipeline and purge stack.
Engineering Project Leader, Engineering Materials Evaluation Centre
2011 - 2013
  • Improved pipeline reliability through root cause failure analysis of material faults and resulting changes to system operation.
  • Managed New Product Introduction programs from evaluation through testing to operational deployment.
  • Led the transition to 250+ standardized pipeline materials, strengthening system integrity across the gas pipeline network.

Volunteer Experience

President, Women in STEM Employee Resource Group
Pacific Gas and Electric Company
California | 2020
  • Led a 6-member board advancing recruitment, retention, and leadership development initiatives for 200+ technical women.

Education

Bachelor of Applied Science (BASc) in Chemical Engineering
University of Waterloo
Canada | 2011

Certifications

Professional Engineer (P.E.)
Board for Professional Engineers, Land Surveyors, and Geologists
California | 2020

Beyond Work

Fashion Design & Patternmaking

Self-taught patternmaker and sewist who designs and constructs custom clothing pieces, applying engineering problem-solving to convert creative concepts into three-dimensional wearable designs. Creator of a YouTube channel (4k+ subscribers since 2023) offering simplified patternmaking methods and sewing tutorials, translating technical skills into accessible educational content.

Founder, Rainbow Bridges

Created and launched a cloud memorial platform as a solo founder, where pet owners can create beautiful, personalized memorial gardens for beloved pets they have lost. Born from the loss of my three foster guinea pigs. Applied the same end-to-end problem-solving and systems thinking as in engineering, driven by the desire to create something meaningful for grieving pet owners.

Guinea Pig Rescue Volunteer

Active volunteer with The Cavy & Hammy Haven since 2020, contributing to adoption events and crafting fleece liners and cuddle pods for rescued guinea pigs. Former foster parent to three guinea pigs who became cherished family members.

World Travel

Enthusiastic traveler who has explored diverse cultures and landscapes across North America, Europe, Middle East and Asia.