His father was a Hungarian tradesman and entrepreneur owning an iron wholesale in Vienna and Budapest.
In 1926 he completed his studies with a dissertation under Moritz Schlick with the title "To What Extent did Schopenhauer Do Justice to Kantian Ethics?"
("Inwieweit ist Schopenhauer der Kant’schen Ethik gerecht geworden?").
Due to his economic independence Juhos could stay in Vienna as a private scholar during the Second World War – except for the period of his military service in 1942–1944.
[2] In 1948 he submitted his Habilitation thesis (venia legendi) with the title "Cognition and its Achievements" ("Die Erkenntnis und ihre Leistung") under Victor Kraft and became Privatdozent (private lecturer).