Callum provided The goals of the bridge are to easy traffic congestion, and as an additional hurricane evacuation route. The public and private sector value these goals differently, leading to interesting commercial challenges. Callum analyzed and addressed the differing valuations of project goals between public and private sectors, facilitating effective negotiations and decision-making.

Callum collaborated with bp pulse to devise a strategic plan for deploying 400 kW DC fast chargers throughout the United States. This initiative involved forecasting electric vehicle charging demands and pinpointing underserved locations lacking adequate charging infrastructure. Furthermore, Callum identified relevant grants and incentives, assisting bp pulse in the application process for securing these funds.

Callum played a crucial role in managing the SCIRF Loan Program for the Texas Department of Transportation, ensuring efficient and effective program administration. He conducted thorough financial and operational due diligence on loan applicants, delivering expert analysis and actionable recommendations.

Callum assisted TDOT in preparing for the procurement of their first-ever public-private partnership, which also marked their largest public spending initiative. His work focused on ensuring compliance with regulatory requirements, coordinating efforts with various public agencies and public outreach.

Callum supported TDOT in preparing for their inaugural public-private partnership, which represented their largest public spending initiative to date. His contributions included ensuring compliance with regulatory requirements, coordinating efforts across multiple public agencies, and facilitating public outreach efforts.

Callum provided ongoing commercial advisory services to Amtrak, a quasi-public corporation, for a public-private partnership deal concerning a multi-million dollar station development during the operations phase. His key responsibilities included reviewing the operator's compliance with abatements to facilitate the accurate calculation of ongoing availability payments.

Callum served as a subject matter expert for the annual audit of a tier one contractor, where he reviewed distressed major projects to inform the audit team of their financial implications. He analyzed remaining contingency funds, outstanding variation orders, and legal claims, offering insights into realistic cost-to-complete estimates. Projects he reviewed included the Automated People Mover at LAX, the electrification of CalTrain between San Francisco and San Jose, and the widening and reconstruction of the eight-lane LBJ Freeway in Dallas, Texas. His expertise contributed to a clearer understanding of project risks and financial health.

Callum supported the development of the Project Policy and Procedures Manual for the
$5.8 billion AUD redevelopment of Delta Air Lines' terminal at LaGuardia Airport. His responsibilities included interviewing stakeholders, completing performance audits of existing controls and drafting policies and procedures to ensure alignment with construction best practices.

Callum provided mechanical, plumbing, and fire protection design services for a 285,000-square-meter Grade A+ office development in Gurugram, India. This work included the coordination of a dedicated sewage and wastewater treatment plant that serviced the four office buildings.

Callum oversaw routine operations and maintenance conducted by a local O&M contractor at RAAF Base Butterworth in Malaysia on behalf of the Australian Defence Force. His responsibilities included reviewing evidence of completed work to ensure compliance with ADF O&M manuals, as well as reviewing and approving purchases for replacement equipment. The O&M activities primarily focused on the operation of a bulk fuel installation and associated support buildings.

Callum worked as a mechanical engineer on the successful tender package for the Tunnel Stations and Development (TSD) work as part of the Pulse consortium.

Callum worked as a mechanical engineering consultant on a 600-bed prison public-private partnership, including the development of a central energy plant that provided hot water for the complex, as well as all heating and chilled water via ring mains. Additionally, he was responsible for the design of the commercial kitchen area, which included a range of gas-fired equipment and a total of eleven kitchen hoods.