2012

SLR acquires GSS Environmental (GSSE), a leading Australian provider of environmental consulting and project management services to clients in the mining, minerals, land development and natural resource sectors.

SLR acquires the business assets of A Speiser Environmental Consultants (ASEC). ASEC is a Namibian-based specialist consultancy that has established a strong reputation for its holistic approach to EIAs which includes consideration of social, institutional and economic factors as well as ecological issues.

2011

SLR acquires Namibian based Bittner Water Consult CC (BIWAC), a leading groundwater consultancy that specialises in the sustainable development, protection and management of ground and surface water resources for a range of clients including the mining industry.

SLR acquires South African based company GreenEng, an environmental consultancy firm offering a high level of technical expertise on environmental projects throughout Africa. The company works in both the waste and energy sectors and manages projects from origination to operational phase. It is also committed to reducing greenhouse gas emissions and exploring renewable energy options, while applying a range of methods including the Kyoto Protocol's Clean Development Mechanism (CDM).

SLR acquires Metago, a South African firm providing environmental consultancy services to the mining industry throughout sub-Saharan Africa and Australia. It consults on all phases of mine life, with a particular specialism in environmental impact assessment, mine waste and water management assessment and design, and works across virtually all commodities.

2010

SLR acquires Hoefler Consulting Group (HCG), a leading Alaska-based provider of specialist permitting and air quality consulting services to clients in the energy and mining sectors, with particular strength in contingency planning for offshore drilling.

SLR acquires Heggies Pty Limited, a leading Australian provider of environmental consulting services to clients in the infrastructure, natural resource and land development sectors. Richard Heggie is appointed Managing Director of SLR (Australia) Ltd.

SLR acquires the UK-based company Andrew McCarthy Associates (AMA) so as to extend its range of ecological capabilities and services and to enhance SLR's growth.

2009

SLR opens its first office in Northern Ireland to consolidate the all-Ireland offering of services to clients.

2008

The U.S. operation opens a new office in Indiana to provide consulting services to clients located in the mid-west and eastern parts  of the country.

3i invests £32.5 million in SLR, and replaces ISIS Equity Partners as minority shareholder, a significant minority stake in the Company. The deal values SLR at approximately £100 million. At the time, SLR has over 650 employees who work from a network of 42 offices located across the UK and USA and has a turnover of approximately £33 million.

SLR acquires the UK-based company FMH Consulting Engineers, in order to expand its structural and civil engineering services to architects, contractors, developers, schools, universities and local authorities, as well as private clients

SLR acquires the Irish Dublin-based environmental consultancy CSA, which is a natural resource consultancy practice that provides technical solutions and strategic advice in the minerals, energy and environmental sectors. Tim Paul is appointed Managing Director of SLR Consulting (Ireland).

SLR signs a collaborative agreement with Greek environmental company, EPEM, to provide environmental and engineering consultancy services across the Balkans

SLR signs a collaboration agreement with Abu Dhabi-based EDESSA as a first stage in SLR offering a full-time presence and a full range of services to our own international clients as well as new clients in the Middle East - and the UAE in particular
SLR acquires the specialist mineral planning, landscape and land management firm Bowman Planton (BPL), which is recognized for its work in the mineral and waste management sectors.

SLR acquires Architecture and Planning Solutions (APS), who is a specialist, and highly regarded provider, of architectural design services for energy recovery facilities.

SLR's U.S. operation opens a new office in Houston, Texas.

2007

SLR renews agreement with Maltese firm, AIS Environmental Ltd, to provide consultancy services across the Mediterranean from AIS's base in Malta.

An agreement is signed between SLR and German Energy from Waste specialists, Born and Ermel, for the two companies to work together to provide a comprehensive service to the private, commercial and public sectors on EfW systems, their design, planning, implementation and management.

SLR acquires the UK-based company Insite Environments so as to expand the landscape, design and master planning capabilities.

SLR acquires Canadian company SEACOR Environmental Inc., to increase the range of services it offers to clients in North America. SEACOR (Canada). Prior to the UK management buy-out in 2000, SEACOR (Canada) was the sister company to SECOR in the UK and daughter company to SECOR in the USA.  SEACOR Canada was originally founded by Alan Sheppard in 1991.

2006

The US Operations hires Randy Rees to extend Financial Sector merger and acquisition services throughout the US.

2005

SLR acquires the UK-based Waste Management Engineering Limited (WMEL) so as to expand its capabilities in waste treatment and pollution control.

The first office in Wales (Cardiff) is opened.

The U.S. operation hires Steve Locke and shortly after opens offices in Portland, Oregon. Additional offices are opened in Salt Lake City and Richmond, Virginia.

2004

Private equity investment is secured from ISIS Equity Partners, who invest £4.85 million as part of a £13 million investment and take a minority stake in the company. At time, SLR employs around 200 staff from its network of 12 offices located across the UK and USA and has a turnover of approximately £15 million.

2003

U.S. operation hires Michael Staton to manage the Seattle-area office and expand SLR's consulting services to clients in the transportation, industry and professional service sectors.

2001

U.S. operation expands into Alaska with new offices established in Anchorage and Fairbanks. SLR Alaska quickly secures multi-year  contracts with upstream oil and gas clients. Andrew Dimitriou relocates to Anchorage to manage Alaskan operations.

2000

The senior management team of SECOR Ltd completes a Management Buyout and the company's name is changed to SLR.
SLR opens a fifth office in the UK and its first office in Scotland (Edinburgh).

SLR establishes U.S. operations and opens a Seattle-area office managed by Kevin Rattue. Shortly after the Seattle office opening, Andrew Dimitriou joins SLR in Seattle and Dr. Mark Stelljes opens a Northern California office to deliver risk assessment and toxicology consulting services to international clients.

1995

Additional UK offices are opened in Bath and Nottingham, with Neil Penhall (currently the UK Managing Director) and Ian Roberts (a UK Director) managing the offices. A further office is opened in Redditch.

1994

SLR is originally founded in the UK as SECOR Ltd by David Richards and Alan Sheppard with the registered company office located in Oxford. David currently sits on the Board of SLR Management Ltd.