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Tim O'Callaghan has been a UK qualified architect since 2008. He studied at Oxford Brookes University, the Bauhaus University in Weimar and the University of Westminster where he was the recipient of the RIBA CLAWSA prize for best design project and the RIBA dissertation prize for his dissertation on CenterParcs.


In between this, Tim worked with OMA in Rotterdam as part of the team for the colossal CCTV building in Beijing and on an urban masterplan for an area equivalent to 20% of the Netherlands.


After completing his education, Tim joined Popularchitecture (now Teatum + Teatum) in London working on a number of significant private houses as well as several competitions. Following this, he worked with David Chipperfield Architects in London where he was a member of the competition winning scheme for Perm Opera House in Central Russia,


Most recently, Tim was Senior Architect at RCKa and project architect for the TNG Youth Venue in Lewisham (winner of a Civic Trust award, National RIBA award ) which has attracted international recognition and was shortlisted for the 2014 Stirling Prize and Mies van der Rohe prize. He was also project architect for a number of RCKa's most significant projects including Open Eye Gallery in Liverpool, Meadow Street Housing in Preston (Winner of Housing Design Award 2011).


Tim is now a director of nimtim architects in London who have already achieved international success including a runners up prize for the competition to design new housing on the island of St Helena as well as securing a number of significant private commissions in London.


Teaching is very important to the practice and Tim and after 3 successful years with UCA in Canterbury, he has recently joined the Reading School of Architecture to play a key role in setting up the new school. Tim has also been a guest critic at University of Westminster, Oxford Brookes, Central St Martins and the Royal College of Art.

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Nimi Attanayake studied at the University of Nottingham and the University of Westminster where she focused on urban scale transformative community projects. She qualified as an architect from London Metropolitan University in 2008 and is an RIBA and ARB registered architect.


Nimi worked for many years (including many summer holidays) for MPA Assoxiates where she was involved in high-end residential and retail projects including Burberry stores and residential developments in Central London.


Nimi has also worked for some of London's most highly regarded practices including Penoyre & Prasad and Hawkins/Brown where she was a project architect for Corby Cube and other significant developments such as Deptford Wharves.


In 2010, Nimi joined Latitude architects where she played a central role in several major projects, most notably 55-73 Duke Street for Grosvener Estates which has recently been shortlisted for the AJ retrofit awards.


Nimi is a member of the Design South East Panel. This multi-disciplinary panel offers a clear, constructive and consistent voice on design quality in the built environment.


Gardens, planting and open spaces have always strongly featured in Nimi's design work and she has completed a RHS Diploma in Gardening and Horticulture at Capel Manor College.


Jessica Spresser completed her Master of Architecture at the University of Queensland in Australia in 2012. She registered as an architect in Australia in 2016 prior to moving to London.


Since graduating, Jessica has worked for a handful of design-focussed practices in Australia and Japan, and completed an internship with Kengo Kuma & Associates in 2014. She has also tutored in the architecture department at the University of Queensland.


Whilst at university, Jessica was awarded the Karl & Gertrude Langer memorial prize for design in 2011 and the Dean’s Commendation for High Achievement from 2009-2012. In her final year in 2012, she travelled to Italy to participate in the Venice Biennale alongside architect Anupama Kundoo, on which she based her thesis ‘Exhibiting Architecture’.


Jessica is also interested in visual art and enjoys drawing in her spare time. In 2016 she held her first exhibition displaying native Australian botanical sketches.



Pippa Grayson completed both her Bachelors and Masters in Architecture degrees at the University of Nottingham, graduating in 2015. She later concluded her studies at Kingston University and is an ARB registered architect.


In 2013, Pippa spent a year working in Tianjin, China, on large scale master-planning projects and speculative public projects, including a new university campus and the conversion of large disused quarry sites to public space.

Since graduating, Pippa has worked in London on small scale residential projects, and prior to joining nimtim was working in south-west London, completing residential refurbishment and extension projects within the borough of Richmond-upon-Thames.


Throughout university, she explored architecture in both sparse rural as well as dense city landscapes, and within her final year Thesis she explored the identity of demarcated landscapes within the UK and the potential of under-sung landscapes for facilitating fast-changing forms of architecture.


Outside of architecture, Pippa has a keen interest in music, particularly in attending and participating in live concerts.


Alexandria Mackinnon completed her Masters in Architecture at the University of Cape Town in December 2015 before moving to London in April the following year.


Allie’s masters dissertation involved studying the architectural facade as an interface between the inside and the outside of public, representational buildings. Allie chose to explore this idea through the re-imagining of Parliament as the pre-eminent public building of South Africa’s democracy and the city of Cape Town.


Prior to joining nimtim, Allie worked with the Dutch-based firm Play the City in creating games as a method for collaborative urban design - using gaming as a playful way to bring top-down decision makers together with bottom-up members of society.


In 2013 Allie worked in Berlin on small to medium-sized residential refurbishments and extensions - understanding the richness and sensibilities of the existing city fabric. Throughout her studies Allie enjoyed working at a local artisan market selling fine jewellery and fun textile products.


Apart from her interest in architecture Allie is interested in many forms of art and design including pottery, surface/textile design and photography – she has recently developed her first reel of film after her trip to Iran.




Neil Cockburn completed his undergraduate degree at the Glasgow School of Art in 2015 before joining nimtim architects later that September. He is currently continuing his studies at the London Metropolitan University to complete his Part 2.


Since joining nimtim architects Neil has worked on a variety of residential projects across South London. He particularly relishes model-making and sketching by hand.  Outside of architecture, Neil has a great passion for cooking, sport and travelling.



Aron Lewer completed his undergraduate degree at The University for the Creative Arts in 2017 before joining nimtim later that year.


During his first three years of study, Aron created collection of projects exploring ideas of programmatic landscaping, a mountain bike development centre, collaborative housing in response to Brexit and a international malt house to strengthen and diversify the Nordic market. He was also part of the winning team of the 2017 AIA Student Charrette along with fellow UCA students.



Sarah McIntosh gained her BA and MA from the Courtauld Institute of Art, University of London. Since then she has worked primarily in the arts. She was gallery manager of the Zelda Cheatle Gallery for 5 years and then manager of a photographic archive.


When not at work Sarah can be found dragging her family around various local, and not so local, art galleries.



Corbi graduated from the Dulwich Dog School in 2013 winning the prestigious ‘most improved puppy’ prize.


Having gained significant experience in the Parks and Waterways sectors, Corbi heads the office’s landscape team with a particular focus on daily surveys of nearby parks and woods.


Corbi retains an interest in domestic architecture, particularly comfortable sofas and window seats. Outside of the office, Corbi enjoys chasing tennis balls, chocolate cake and cuddles.

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