Mr. Walker, also known by its parenthetical subtitle Renie, is a jazz composition by guitarist Wes Montgomery, first recorded in 1960 for his album The Incredible Jazz Guitar of Wes Montgomery on Riverside Records. Written as a 32-bar AABA form, the piece is distinguished by its rhythmic character, featuring an energetic groove that alternates with stop-time passages to create a dynamic, punchy feel. This contrast between the driving rhythmic sections and the punctuated breaks gives the composition a lively, bluesy personality that sets it apart from the more harmonically complex pieces on the same album. The melody, composed for guitar, exploits this rhythmic interplay to produce a theme that is both accessible and engaging, with Montgomery's characteristic single-note lines and blues-inflected phrasing woven throughout the form. The stop-time sections serve as dramatic devices that momentarily suspend the groove before it reasserts itself, adding an element of surprise and swing to each pass through the form. Mr. Walker represents a different facet of Montgomery's compositional range compared to more adventurous pieces like Four on Six or West Coast Blues from the same session, demonstrating his ability to write tunes with immediate rhythmic appeal while maintaining the sophistication expected in a jazz context. Though it remains a deeper cut in Montgomery's catalog rather than a widely covered standard, the tune has been arranged for big band settings and continues to be appreciated by musicians drawn to its groove-oriented character and its reflection of Montgomery's versatility during his pivotal Riverside Records period.