Office Manager

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At Green Gas, we’re helping lead the global energy transition by transforming waste into renewable energy and measurable decarbonization. We’re a fast‑growing team of expert innovators, engineers, and problem‑solvers committed to advancing global sustainability, fueling a circular economy, and creating a cleaner future for all. Join us and help shape the future of renewable energy.

Office Manager

Location:

Houston, TX

Reports To:

CEO

Type:
Full‑time

The Office Manager & Executive Assistant is responsible for the overall management, coordination, and effectiveness of the Houston office, a 15‑person onsite location. This role owns all aspects of the physical office environment and day‑to‑day operations while providing executive administrative support to senior leadership. The position requires a high degree of autonomy, judgment, and discretion. The individual in this role ensures the office operates efficiently, supports productivity, and reflects company standards, while anticipating needs and resolving issues independently.

• Own and manage daily office operations to ensure a safe, functional, organized, and professional workplace
• Serve as the primary point of contact for building management, landlords, vendors, and service providers
• Coordinate facilities maintenance, repairs, cleaning, security access, and office equipment
• Manage office supply inventory, ordering, and vendor relationships
• Monitor and manage office‑related expenses, invoices, and budget tracking
• Ensure compliance with workplace safety standards, company policies, and operational procedures
• Coordinate office setup for new hires, including workspace readiness, equipment, and access
• Manage office moves, space planning, and reconfigurations as required
• Develop, document, and improve office processes and operational workflows

• Provide administrative support to senior leadership, including calendar management, scheduling, and meeting coordination
• Prepare meeting agendas, materials, presentations, and follow‑up documentation
• Coordinate travel arrangements and itineraries
• Maintain confidential records and handle sensitive information with discretion
• Support executive‑led initiatives and special projects as assigned

• Act as the central point of coordination for office communications and logistics
• Coordinate internal meetings, leadership sessions, client visits, and onsite events
• Ensure consistent standards for office presentation, organization, and hospitality
• Support internal communication related to office operations and scheduling
• Partner with HR, IT, and leadership to support onboarding, engagement, and operational needs

• Independently manage day‑to‑day office operations and vendor coordination
• Make operational decisions within established budget and policy guidelines
• Escalate issues that materially impact cost, risk, or business continuity

• Minimum of 5 years of experience in office management, executive assistance, or a combined role
• Demonstrated ability to manage an office environment independently
• Strong organizational, time management, and prioritization skills
• Excellent written and verbal communication skills
• High level of discretion and professionalism
• Proficiency with Microsoft Office and scheduling tools

• Experience supporting senior or executive‑level leaders
• Experience managing office budgets and vendors
• Experience in a professional services or corporate environment

• Operational ownership
• Attention to detail
• Judgment and discretion
• Problem‑solving
• Communication and coordination
• Service orientation

• Ability to be onsite full‑time in the Houston office
• Ability to lift and move office supplies and equipment as needed
• Ability to sit, stand, and move throughout the office during the workday