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In various environments, consonant sequences are produced with articulatory overlap and show durational changes. This paper investigates the durational pattern of stop consonant sequences at word boundaries in the speech of native English speakers and Korean learners of English. Stop release and duration of consonants were measured to compare durational patterns of the two speaker groups. Phonetic factors taken into account include stress, voicing, and place of articulation of the consonants. Compared to Korean learners of English, native English speakers had higher percentage of stop release. Stop sequence durations of native English speakers were longer in words with stress than in neutral words. For Korean learners of English, the opposite was true. The characteristic durational pattern in the speech of Korean learners of English is discussed in terms of L1 transfer.