T3 has installed Jennifer Walker as an account supervisor for new business. Prior to joining the Austin, Texas, shop, Walker held a similar position at nearby Tocquigny. The agency has also hired Meredith Gunthorp as a senior account executive for Dell Catalog. Gunthorp most recently was an account supervisor at McGarrah/Jessee in Austin. Katy Mueller and Courtney Ward have come aboard as interactive designers. Mueller previously was a designer at Euro RSCG 4D in New York. Ward arrives from Austin's Renew Data Corp., where she was as an interactive and graphic designer. In addition, T3 has added Chrissy Ragan and Casey Johnson as junior copywriter and production artist, respectively. Ragan joins the shop from the Austin American-Statesman, where she was an editorial assistant. Johnson previously worked as a freelance production artist for the agency.