[3] In 1964, Ootising was a cofounder of the influential art collective ANK '64, with other young artists who received art education at the State Art Institute of the Estonian SSR (ERKI), which included Tõnis Vint, Malle Leis, Jüri Arrak, Kristiina Kaasik, Tiiu Pallo-Vaik, Vello Tamm, Marju Mutsu, Tõnis Laanemaa, Anu Liivak, Sigrid Saarep, and Aili Vint.
Their activities aroused suspicion by Soviet authorities and the group were frequently monitored by the KGB.
[4] ANK' 64 disbanded in 1969 and is credited as playing an important part in renewing the contemporary art scene in Estonia in the 1960s.
Album, dedicated one-hundred works of visual art to the 100th Anniversary of the Estonian Republic, with an emphasis on Võrumaa was held in Võru and Tartu in 2018.
[2] He has worked extensively as a graphic artist and graphic designer and has become well known as a book designer and illustrator; beginning in the early 1970s, he has designed and illustrated books written by A. H. Tammsaare, Jaan Kaplinski, Eduard Vilde, Eno Raud, Mats Traat, Paul-Eerik Rummo, Viivi Luik, Arvo Valton, Friedrich Issak, William Golding, Arthur van Schendel, Alexander Blok, Ingmar Bergman, Vladislav Titov, and Rachel de Queiroz.