UCDS Staff

IAN NIMMO – President
Mr. Nimmo is a member of IET (CEI) in the UK as well as a Fellow Member of ISA. He joined Honeywell, Inc. in 1990 as a Chemical Engineering Specialist. During his time at Honeywell, he was instrumental in leading efforts to obtain NIST government funding and the Abnormal Situation Management (ASM) Consortium program. Mr. Nimmo is a founder and former Program Director of the Abnormal Situation Management (ASM) Consortium. Mr. Nimmo saw a need in the marketplace for overall control room and human factors expertise. To fill this void, he left Honeywell and founded User Centered Design Services, Inc. in 2000. Prior to beginning the work of founding the ASM consortium in 1991, Mr. Nimmo was Computer Applications Section Manager for a large petrochemical company (ICI) and worked with the British Government’s Health & Safety Executive introducing national and international computer systems standards. His experience in the Refining and Petrochemicals Industry spans more than 40 years.
DAVID LEE – Vice President
Mr. Lee has a Chemical Engineering Degree from the University of Birmingham, UK and is a Chartered Chemical Engineer. He has more than 25 years of experience in the Chemical Industries as an engineer and project manager and has held various positions within production management. During this time, he was instrumental in many greenfield and upgrade process and automation projects, from some valued at a few thousand dollars to others that were multi-million dollar endeavors. Mr. Lee has been fortunate to have worked on the full range of technologies from pneumatics to state-of-the-art DCS and bussed instrumentation. Within the companies he worked for, he was considered a subject matter expert in batch operation, human machine interface design, alarm management and safety system design. As such, Mr. Lee helped with early adoption of industry standards such as IEC-61508, ISA-84 and ISA-88. Since first joining UCDS in 2007, he has been involved in successful projects encompassing the full range of UCDS services across multiple industries around the world. He is an active member of ISA, serves as the Vice President and Secretary of his local branch, and is involved in the development of several new automation standards.
HARLIN GRAF – Senior Consultant
Mr. Graf has a degree in Chemical Engineering from the University of Tulsa. His 33 year career with a major oil company has given him a vast diversity of experience in both the technical and  operations/management arenas. He has specific experience as a design engineer, chief process engineer, operations superintendent, operations manager, project manager, tech services manager, and refinery site manager. With two international assignments, he has a better understanding of how cultural differences play a key role in refining management organizations. During his career, Mr. Graf was intimately involved in the implementation of the Central Control Room concept at four different locations. This involvement included initial project development, construction, operations, and maintenance organizational staffing, and final implementation and move-in. In addition, Mr. Graf has a vast working experience with refining safety, operations, optimization and trouble shooting. At one of his international assignments, he was involved with completing construction, operator staffing and training, and starting up a grass roots refinery. This was particularly challenging, since many of the processes and computer aids we take for granted didn’t exist at that location.

Mr. Williams has more than 30 years of training experience, with 25 years in the petrochemical industries.  He is experienced in every phase of training, including assessment, design, development, implementation, and evaluation.  Mr. Williams has also managed multiple operator training material development projects.  He recently designed the operator training materials for a new plant start up, assembled a writing team, and completed the project under budget, and within the required timeline.  This was particularly demanding since much of the equipment and process documentation was yet-to-be developed.

STEVE MADDOX – Sales Director
Mr. Maddox has an extensive background in Alarm Management Software sales and has helped thousands of customers develop solutions to improve situation awareness through alarm management, HMI design, and control room design. Over the last two years, Steve has participated in solutions development for 39 pipeline companies due to the pipeline industry PHMSA regulations for Control Room Management. He joins UCDS to help our customers understand the services and benefits we provide and will be contacting both our new and previous customers to improve our services as we expand our company offerings.
Over the past 20 years, Mr. Heil has gained invaluable knowledge and experience in providing Building Design, Project Management, Quality Assurance Analysis, Construction Document/Specification preparation, and Construction Owner Representation for a diverse range of building types in Operations Control environments. With involvement in more than 40 projects, Mr. Heil has focused on total plant building architecture, including Control Buildings, Warehousing, Laboratories, Administrative Offices, Operations Residences, Recreational Amenities, and Fire/EMS Facilities in both blast and non-blast configurations. His familiarity with Industry Procedures, both inside and outside the fence lines, brings strong design skills, technical proficiency, and well-rounded experiences that add great value to any facilities project. His addition to the team compliments UCDS’ many services and provides the next level of Control Building and Facility planning.
CHRISTI MEZZIC – Senior Consultant
Christi has a Chemical Engineering Degree from Texas A&M University. She has 20 years of experience in the polyolefins and chemical industries, primarily in production management. Ms. Mezzic has served on many teams involved with troubleshooting, process improvements, and new equipment systems design, as well as redesigning, refurbishing, commissioning, and operating a moth-balled production unit. In her most recent role, Ms. Mezzic served as co-facilitator, alongside a union representative, introducing a new, employee-driven, behavior-based safety process. She also provides expertise in staffing, having participated in or led many operator staffing studies.  Her work experience provides valuable insight to staffing issues, which allows her to identity the proper staffing levels for both control room and field operators.
MELINDA LEHMAN – Executive Administrator
Ms. Lehman graduated from Arizona State University with a Bachelor of Science in Business Administration. She has worked as an assistant to executive directors and presidents of several companies over the past 17 years. Ms. Lehman’s organizational, administrative and accounting skills are a great asset to our company.