The Process Group, LLC
The Process Group, LLC is a Missouri-based chemical process engineering consultancy delivering FEL/FEED, process design, and Owner's Engineer services to enterprise clients in energy, renewables, chemicals, food & beverage, and process safety industries using AspenTech and AFT tools. Acquired by Olsson in March 2026.
- Company typePrivate
- Founded-
- HeadquartersChesterfield, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What The Process Group, LLC does
The Process Group, LLC (TPG Engineers) is a Missouri-based chemical process engineering and consulting firm headquartered at 14567 N Outer 40 Rd., Suite 480, Chesterfield, MO. Founded in 2020 and operating with approximately 14 employees (roughly 15 engineers), TPG delivers Front-End Loading (FEL), Front-End Engineering and Design (FEED), and process design services to enterprise clients, with cost estimation targeting AACE class 3, 4, and 5. Its practice spans process development and design (process modeling, hydraulic networks, PFD/HMB development, sanitary design, reactor and heat exchanger design, scale-up/scale-down), fire, risk, and environmental services (fire water studies, VOC control, pressure relief design, PHA/HAZOP/LOPA facilitation), GTL/flare gas/waste-to-energy consulting (gasification, pyrolysis, GTL reactor design), and business case studies including techno-economic assessments. Engineers execute projects using the AspenTech suite (Hysys, Plus), AFT Fathom and Arrow, AutoCAD, and Bluebeam, with the firm's core competency rooted in over 200 years of combined staff experience averaging 15-25 years per engineer. CEO John Reardon is a named inventor on two awarded US patents (8,580,019 and 6,497,856) covering syngas generation, gas cleanup and conditioning, and custom equipment design.
The firm serves enterprise clients across five primary verticals: Energy & Renewables (waste energy, green hydrogen, green methanol, plastic waste upcycling, solar thermal, biomethane, ethanol from biomass), Chemicals & Process Industries (rare earth processing, agrochemicals, wastewater, consumer health), Food & Beverage (pea flour extraction, fermentation, confectionery, pet food), and Process EHS (VOC control, fire water, vent sizing/tank blanketing). Disclosed engagements include a Green Methanol pilot with Methylennium Energy Corporation, a 75 TPD biomass gasifier project with Frontline BioEnergy LLC, an amine unit collaboration with Ammongas A/S in Denmark, and a subrecipient role on the University of Illinois IRENES rare earth processing project. TPG operates as a private LLC licensed to provide engineering services in 10 US states, with some jurisdictions (such as Illinois) requiring PLLC registration. The firm's revenue model is purely professional services, billed on a project basis or time-and-materials with multi-year contract cadence, and quoted per engagement without public pricing tiers.
TPG was acquired by Olsson on March 11, 2026, after a period of project partnership, and is now positioned as a unit within Olsson's broader engineering services platform. The acquisition followed TPG's growth trajectory from its 2020 founding through its multi-vertical enterprise client base. As of acquisition, the company redirected its website to Olsson.com for ongoing client and career engagement, while retaining its Chesterfield, MO operational base and its core chemical process engineering identity under the TPG Engineers brand.
The Process Group, LLC firmographics
Firmographics- Name
- The Process Group, LLC
- Legal name
- The Process Group, LLC
- Website
- https://tpgengineers.com
- Company type
- Private
- Operating status
- Acquired
- Headcount range
- 11–50 employees
- Short description
- The Process Group, LLC is a Missouri-based chemical process engineering consultancy delivering FEL/FEED, process design, and Owner's Engineer services to enterprise clients in energy, renewables, chemicals, food & beverage, and process safety industries using AspenTech and AFT tools. Acquired by Olsson in March 2026.
- Ownership category
- akta.pro rank
The Process Group, LLC industry classification
Industry- Product category
- Process Engineering Services
- NAICS
- Engineering Services (54133), Engineering Services (541330), Architectural, Engineering, and Related Services (5413)
- SIC
- Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)
- akta.pro primary industry
- Reliability, Safety & Risk Engineering (RAMS/PSM) Consulting (BPAHAIAK)
- akta.pro secondary industry
- Systems Engineering & Technical Program Management (BPAHAIAI)
Keywords
Where The Process Group, LLC is headquartered
LocationHeadquarters
- HQ city
- Chesterfield
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
The Process Group, LLC business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales
Revenue model
- Engineering Consulting Services: Professional engineering services billed on project basis or time and materials. Services include process development, FEED studies, owner's engineer roles, process design documentation, and technical consulting across multiple industries.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Project-based engineering consulting |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels4 records
The Process Group, LLC product offering
Product offeringCore offering
The Process Group, LLC (TPG) is a Missouri-based process engineering services firm providing consulting in chemical engineering and process/mechanical design. Services span Front-End Loading (FEL) and Front-End Engineering and Design (FEED) targeting AACE class 3, 4, and 5 cost estimation, including process modeling, hydraulic network design, Owner's Engineer roles, bid package development, PFD/HMB development, fire and relief system design, HAZOP/LOPA facilitation, and field commissioning support across energy, renewables, chemicals, food & beverage, and process EHS industries.
Product overview
The Process Group, LLC (TPG) is a Missouri-based process engineering services firm, not a product software company. TPG provides professional engineering consulting services rather than a unified software product or platform. Their service offerings are organized into four main categories: (1) Process Development & Design services including process modeling, hydraulic networks, PFD/HMB development, utility analysis, sanitary design, FEL studies, budgetary cost estimation, reactor/heat exchanger design, and scale-up/scale-down; (2) Fire, Risk, and Environmental services including fire water studies, VOC control, flare system design, pressure relief design, and PHA/HAZOP/LOPA facilitation; (3) GTL, Flare Gas, and Waste to Energy consulting including gasification, pyrolysis, and GTL reactor design; and (4) Business Case Studies including techno-economic assessments and engineering economics. TPG engineers leverage industry tools including the AspenTech suite, AFT Fathom, AFT Arrow, and AutoCAD to deliver these services across energy, renewables, chemicals, food & beverage, and process EHS industries.
Differentiator
Problem solved
Functional benefit
Products and services
- Process Development and Design Services
- Fire, Risk, and Environmental Services
- GTL, Flare Gas, and Waste to Energy Consulting
- Business Case and Techno-Economic Studies
- Owner's Engineer Services
Companies that use The Process Group, LLC
Customer profileNamed customers4 records
Segments4 records
Ideal customer profiles3 records
The Process Group, LLC technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
The Process Group, LLC partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered core and minor.
- OlssoncoreThe Process Group, LLC (TPG) has been acquired by Olsson. After working together as project partners, the companies joined forces officially. TPG is now part of Olsson to expand services, opportunities, and expertise offered to clients and employees.
- University of Illinois (IRENES)coreTPG joined the Illinois Rare Earth Novel Extract & Supply (IRENES) project as a subrecipient to the University of Illinois. Focus on rare earth processing and element recovery.
- Methylennium Energy Corporation (MLE)coreMethylennium Energy Corporation and The Process Group, LLC partnered in Green Methanol pilot and demonstration plant design. TPG provided investment and engineering expertise for the green methanol project.
- Ammongas A/SminorCollaboration on Amine Unit project in Denmark. TPG provided process engineering services for the project.
- Frontline BioEnergy LLCminorCVEC Groundbreaking for 75 TPD Biomass Gasifier project. TPG team member John Reardon attended the groundbreaking ceremony.
Scale indicators2 records
Recent moves7 records
Expansion highlights6 records
The Process Group, LLC competitors and assessment
Company assessmentDirect peers
- Process Engineering Associates: Process Engineering Associates is a closely comparable small US process engineering consultancy providing FEL/FEED, process modeling, and owner's engineer services—overlapping directly with TPG's core FEL/FEED offering for chemicals, refining, and energy clients.
Broad incumbents
- Jacobs Solutions: Jacobs is a major global engineering and consulting firm with process engineering and owner's engineer capabilities across chemicals, advanced facilities, and energy transition—overlapping service portfolio with TPG.
- Black & Veatch: Black & Veatch provides engineering, procurement, and consulting services in energy, chemicals, and renewables; comparable to TPG in scope of process and mechanical engineering services but with global scale and EPC delivery capability.
- GHD: GHD is a global engineering, architecture, and consulting firm with process engineering capabilities across water, energy, and chemicals—comparable service breadth to TPG with significantly larger headcount and geographic coverage.
- Olsson: Olsson is the national engineering firm that acquired TPG in March 2026; as TPG's parent, it offers overlapping process and mechanical engineering capabilities but at much larger scale across power, water, and infrastructure markets.
- Burns & McDonnell: Burns & McDonnell is a large US engineering, construction, and consulting firm with process engineering capabilities across chemicals, energy, and food & beverage—directly comparable to TPG's verticals but at materially greater scale.
- Worley: Worley is a global engineering and project delivery firm with a strong process engineering practice in energy, chemicals, and renewables—similar service portfolio to TPG but executed at global EPC scale.
- KBR: KBR provides sustainable technology, engineering, and consulting services with deep process engineering capability in hydrogen, ammonia, refining, and petrochemicals—comparable verticals and process design work to TPG.
Emerging players
- Process Consulting Services: Process Consulting Services is a smaller US process engineering consultancy providing FEL studies, process design, and owner's engineer services—comparable in size and service offering to TPG, particularly in refining and chemicals.
- Trinity Consultants: Trinity Consultants provides EHS and process safety consulting including HAZOP, LOPA, and PSM services—directly overlapping with TPG's process safety and risk engineering practice for industrial and chemical clients.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat3 records
Key risks7 records
Key highlights7 records
Customer concentration
The Process Group, LLC social profiles
Digital presenceThe Process Group, LLC financial estimates
Financial estimateRevenue estimate
Valuation estimate
The Process Group, LLC leadership team
Management profileNumber of profiles
Profiles15 records
The Process Group, LLC funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
The Process Group, LLC M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about The Process Group, LLC
What does The Process Group, LLC do?
The Process Group, LLC (TPG) is a Missouri-based process engineering services firm providing consulting in chemical engineering and process/mechanical design. Services span Front-End Loading (FEL) and Front-End Engineering and Design (FEED) targeting AACE class 3, 4, and 5 cost estimation, including process modeling, hydraulic network design, Owner's Engineer roles, bid package development, PFD/HMB development, fire and relief system design, HAZOP/LOPA facilitation, and field commissioning support across energy, renewables, chemicals, food & beverage, and process EHS industries.
Is The Process Group, LLC a public or private company?
The Process Group, LLC is a private company. It is classified as corporate owned and is currently acquired.
When was The Process Group, LLC founded?
The Process Group, LLC was founded in -1. It employs 11 to 50 people.
Where is The Process Group, LLC based?
The Process Group, LLC is headquartered in Chesterfield, United States, in the North America region.
How does The Process Group, LLC make money?
One revenue line is on record: engineering Consulting Services.
Who are The Process Group, LLC's main competitors?
Process Engineering Associates is listed as a direct peer. Broad incumbents are Jacobs Solutions, Black & Veatch, GHD, Olsson, Burns & McDonnell, Worley and KBR. Emerging players are Process Consulting Services and Trinity Consultants.
Does The Process Group, LLC have an API?
No public API is recorded for The Process Group, LLC.
What industry is The Process Group, LLC in?
The Process Group, LLC's product category is Process Engineering Services. Its primary akta.pro industry code is BPAHAIAK, Reliability, Safety & Risk Engineering (RAMS/PSM) Consulting, with a secondary code of BPAHAIAI, Systems Engineering & Technical Program Management. Its NAICS code is 54133 and its SIC code is 8711.