Dan Barry
July 11, 1923 (Long Branch, New Jersey, USA) Dan Barry began his comic book career in the early 1940s, at the age of 19. Among others, he worked on Airboy and Doc Savage. In 1943, he entered the military and wound up in the Air Force where he drew a comic strip for a service magazine. After the war, he returned to the comics field, drawing stories for titles like Crimebusters and The Heap. He then assisted Burne Hogarth with the Tarzan strip which he took over in 1947 and drew until 1948. He went on to draw Flash Gordon written by the legendary Harvey Kurtzman. Artists assisting him with this project included Frank Frazetta and Jack Davis.

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Other Tarzan Strips by Dan Barry (Storyline by Rob Thompson):
Tarzan at the Earth's Core (108 days) - assisting Burne Hogarth ~ Sept. 1, 1947 - Jan. 3, 1948 (2509-2616)
Tarzan at the Earth's Core (24 days) - Jan. 5, 1948 (2617-2640)
Tarzan and the Diamond of Ashra (192 days) (2641-2832)
Tarzan and the Fires of Tohr (60 days) (2833-2892)

John Lehti
(20/7/1912 - 1991, USA) According to Ron Goulart, who had an interview with John Lehti, Lethi, as some people have claimed over the years, did NOT do the Tarzan dailies. According to Bob Barrett, however, Vern Coriell did an interview with John Lehti and Dan Barry in which they claimed that Lehti was ghosting for Barry and DID the Tarzan daily.

John Lehti grew up in Brooklyn and studied at the Art Students League and the Beaux Arts Institute. His first published work appeared in pulp magazines in 1935. He also assisted on the 'Secret Agent X-9' comic. Lehti eventually moved to comic book art and joined the staff of National Periodicals (the future DC Comics). There, he worked on features like 'The Crimson Avenger', 'Sgt. O'Malley of the Redcoat Patrol', 'Steve Conrad, Adventurer' and 'Cotton Carver'.

In the spring of 1946, Lehti sold his comic strip 'Tommy of the Big Top' to King Features, which ran until 1950. With the strip's demise, he returned to DC to draw 'Big Town' and 'Tarzan'. In the early 1950s, Lehti switched to Western, where he illustrated stories with 'Lassie', 'Tom Corbett, Space Cadet' and 'Flash Gordon'. Lehti sold 'Tales from the Great Book' to Publishers Syndicate in 1954. It became a Sunday feature for many newspapers and ran until 1972. John Lehti returned to DC once again and worked on 'Sgt. Rock' and 'The Losers' in the mid 1970s. He retired in the 1980s. 

Ref: Lambiek.net

According to Ron Goulart, who had an interview with John Lehti, Lethi did NOT do the Tarzan dailies. But, according to Bob Barrett, Vern Coriell did an interview with John Lehti and Dan Barry in which they claimed that Lehti was ghosting for Barry and DID the Tarzan daily.

Ref: ERBzine Artist Encyclopedia

Jostein Hansen of Norway claims that strips 2719-2832 and 2893-2958 were mainly ghosted by Emil Gershwin.

Jostein Hansen

Paul Reinman
(September 2, 1910 Germany - September 27, 1988) Ref: Wikipedia