Business Details
25 Years
experience
Emergency
services
Critical Power & Infrastructure Solutions for Mission-Critical Facilities
MDI Access is a leader in critical power and infrastructure solutions with over 30 years of experience. We specialize in design/build services, critical power systems, and maintenance agreements for mission-critical facilities. Our expertise spans the design and construction of data centers, colocation facilities, and switch rooms. We serve industries where downtime is not an option, including financial institutions, 911 centers, medical facilities, and municipalities. Our team combines deep technical knowledge with a commitment to customer service.We have designed, built, and retrofitted over 2 million square feet of critical infrastructure. Our vendor-neutral approach ensures optimal equipment selection tailored to each client's unique needs. We prioritize energy efficiency and sustainability in our designs. Our team includes LEED-certified professionals and members of leading industry organizations. We are dedicated to continuous education to stay ahead of emerging technologies and industry standards.
Services
Design/Build Services
Critical Power Solutions
Equipment Sales
Maintenance Agreements
Data Center Construction
Infrastructure Retrofitting
UPS Installation
Generator Setup
Cooling Systems
DC to AC Power Conversion
Details
- Year established: 2001
Highlights and features
- We have 30+ years of experience in critical power and infrastructure solutions.
- Our team includes LEED-certified architects and NCARB-certified professionals.
- We've designed and built over 2 million square feet of mission-critical space.
- Our vendor-neutral approach ensures optimal equipment selection for every project.
- We specialize in serving industries where downtime is not an option.
Associations and certifications
- LEED
- NCARB
- IBEW Local 134
Services
Design/Build Services
Our design/build services deliver end-to-end infrastructure solutions for mission-critical facilities. We handle every phase from planning to execution, ensuring seamless integration of power systems, cooling, and security. Our 30+ years of experience have produced over 2 million square feet of optimized, future-ready spaces for data centers, colocation facilities, and telecommunications hubs.
Critical Power Solutions
We design and implement resilient power systems that guarantee uninterrupted operation for critical infrastructure. Our solutions include uninterruptible power supplies (UPS), battery systems, generators, and static switches. With expertise in N+1 redundancy and advanced surge protection, we ensure maximum uptime for clients in finance, healthcare, and emergency services.
Equipment Sales
As a vendor-neutral supplier, we offer unbiased equipment solutions for mission-critical power systems. Our offerings include UPS units, power distribution units, inverters, and surge suppression devices. We evaluate technical requirements and budget constraints to recommend optimal equipment partnerships with leading manufacturers and emerging innovators.
Data Center Construction
We specialize in constructing data centers with advanced power, cooling, and fire suppression systems. Our projects feature scalable designs, redundant infrastructure, and energy-efficient technologies. From 68,000 sq. ft. Chicago facilities to 57,000 sq. ft. Iowa centers, we deliver mission-critical environments meeting N+1 cooling standards and pre-action fire systems.
Maintenance Agreements
Our maintenance programs ensure continuous operation of critical power systems through scheduled inspections and emergency response. We provide preventative care for UPS units, generators, and battery systems. With 24/7/365 service availability, we help clients maintain optimal performance while minimizing unplanned downtime risks.
People
Robert Heiderscheidt
President and CEO
27-year electrical industry veteran with expertise in telecommunications infrastructure. Founded MDI Electrical Construction in 1992 and MDI Access in 2001. Holds extensive experience in data center design and executive leadership. Graduated top of class from IBEW Local 134 apprenticeship program.
Mark Untiedt
Chief Operating Officer
LEED-certified architect with 18 years in mission-critical construction. Specializes in large-scale facility projects and energy-efficient designs. Previously consulted for Cubellis and Carlson. Brings deep technical knowledge of data center infrastructure and alternative energy integration.
Christopher Krestel
Chief Business Development Officer
Licensed architect with 10 years in project management and client relations. NCARB-certified with expertise in BIM technology. Focuses on improving design processes and energy efficiency. Active member of American Institute of Architects (AIA) and local architectural review committees.
John Heiderscheidt
Chief Compliance Officer
Licensed attorney and telecommunications broker managing regulatory compliance. Oversees contractual and legal matters for multi-jurisdictional projects. Provides legal expertise for data center site selection and cryptocurrency hosting operations. Previously operated a corporate and criminal defense law practice.
Bob Matthews
Vice President of Sales
42-year veteran in mission-critical applications with Fortune 500 project expertise. Excels in technical sales and project execution. Brings extensive industry network and operational leadership to MDI's sales division. Recognized for managing complex infrastructure projects across diverse market sectors.
Questions
What industries does MDI Access serve?
We serve financial institutions, emergency services, medical facilities, transportation networks, municipalities, and other mission-critical operations requiring uninterrupted infrastructure.
Do you handle international projects?
While our headquarters focuses on US operations, our expertise extends to projects across North America with multi-national client support capabilities.
What power system redundancies do you implement?
We design N+1 redundant power systems with dual-corded equipment, static switches, and multiple generator systems to ensure continuous operation during maintenance or outages.
Can you retrofit existing data centers?
Yes, we specialize in upgrading legacy infrastructure to meet modern efficiency and capacity requirements while maintaining operational continuity during construction.
How do you ensure equipment remains current?
Our vendor-neutral approach maintains relationships with all major manufacturers. We continuously evaluate emerging technologies to recommend future-ready solutions that match client budgets.
Is 24/7 support available?
Yes, our critical infrastructure expertise includes 24/7/365 emergency response services to address urgent power system issues and minimize operational disruption.
