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Meet the Team
We're more than just a group of people running a business. We are a team of experts who are passionate about what we do and why we do it. Dedicated to success, find out more about our people and what drives them.
DIRECTORS
Mandukhai Nanzad is the Executive Director and CEO of Excelsior Energy Mongolia LLC, bringing over a decade of senior leadership experience across project management, international business development, and cross-border operations. With a distinguished career spanning both the public and private sectors, Mandukhai offers a rare depth of understanding in navigating the political, regulatory, and commercial landscapes of Mongolia and the Central Asian region.
Her close connections within government and institutional circles are strengthened by her ongoing involvement as a member of the Supervisory Board of the Social Democratic Women’s Association and as an active trade and foreign investment advisor. Fluent in Mongolian, Russian, and English, she is a key facilitator of collaboration between international partners and regional stakeholders.
Mandukhai plays a vital role in guiding Excelsior Energy’s strategic direction, with a focus on integrated project execution and sustainable energy resourcing. Her leadership continues to drive growth across Central Asia by aligning Excelsior’s engineering and energy services with evolving national priorities in energy transition, infrastructure development, and economic resilience.
Executive Director / CEO
Mandukhai Nanzad
Michael Siefert is the Managing Director of Excelsior Energy, with over 15 years of international experience in the resource sector. He is recognised for his strategic leadership, technical expertise, and consistent delivery of complex projects across diverse industries. His background spans the full project lifecycle in both conventional and emerging energy markets, including engineering design, operations, technology development, and corporate governance. Michael has played a key role in guiding Excelsior Energy’s growth as a trusted provider of integrated solutions in well engineering, energy infrastructure, and sustainable resource development.
In addition to his role at Excelsior Energy, Michael also holds executive and board-level positions—including CEO, Director, and CTO—in several other resource-focused companies, where he contributes to strategy, innovation, and business development across the broader energy and infrastructure landscape.
With a focus on long-term value creation, responsible development, and technical excellence, Michael continues to lead Excelsior Energy in delivering tailored, high-impact solutions that meet the evolving needs of governments, industry partners, and communities across the region.
Managing Director
Michael Siefert
MANAGEMENT
Operations Manager
Battegshbuyan Boldbaatar
Battegshbuyan Boldbaatar is the Operations Manager of Excelsior Energy, bringing nearly a decade of technical and field-based experience across Mongolia’s energy and industrial sectors. With a background in chemical engineering, he offers a strong foundation in operational execution, analytical processes, and practical problem-solving in dynamic project environments.
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His experience spans field operations in coal seam gas (CBM), gas measurement, and chemical technology, developed through roles in several of Mongolia’s leading energy companies. Battegshbuyan is highly skilled in coordinating on-site activities, managing field teams, and ensuring operational efficiency in technically demanding conditions.
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Proficient in Mongolian, English, and Russian, he supports effective communication across stakeholders and contributes to seamless project delivery. His technical expertise and disciplined leadership continue to enhance Excelsior Energy’s ability to deliver reliable, high-performance engineering and energy solutions throughout the Central Asian region.
Business Development Manager
Baasanbat Davaadorj
Baasanbat Davaadorj is the Business Development Manager of Excelsior Energy, where he plays a key role in driving commercial strategy, client engagement, and market growth across Central Asia. With a strong background in business operations, procurement, and project coordination, Baasanbat brings a results-oriented approach to strategic partnership building and cross-border business development.
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He has worked extensively across the infrastructure, mining, and logistics sectors, developing deep regional insight and a strong network of industry relationships. His experience includes facilitating government and private sector projects, managing complex procurement processes, and supporting multinational joint ventures with a focus on execution efficiency and stakeholder alignment.
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Baasanbat is known for his ability to navigate regulatory frameworks and commercial environments across Mongolia and neighbouring markets. His focus on structured growth, client responsiveness, and value-driven solutions contributes significantly to Excelsior Energy’s regional positioning as a trusted and agile service provider.
Engineering Manager
Joseph Dunn
Joe Dunn is the Engineering Manager at Excelsior Energy, responsible for leading the company’s mechanical engineering and design efforts across its project portfolio. With a background spanning field operations, equipment design, and applied mechanical engineering, Joe combines practical field insight with technical precision to deliver robust and fit-for-purpose engineering solutions.
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Following several years of experience in Australia’s coal seam gas (CBM) and mining sectors, Joe returned to the energy industry as a qualified mechanical engineer, bringing a deep appreciation for the operational challenges faced in remote and resource-intensive environments. His work covers the full engineering lifecycle—from concept development and 3D modelling to prototyping, testing, and field implementation.
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Joe’s focus lies in transforming complex requirements into streamlined, engineered outcomes. His collaborative approach, hands-on problem-solving, and proficiency in mechanical drafting and component design support Excelsior Energy’s commitment to delivering dependable, field-ready solutions across the Central Asian region.