In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: Upon returning to Toronto, Jackson published an article about his and Thomson's experience in the Park in the Toronto Sunday World, included in which were several illustrations. After this initial experience, Thomson and another colleague, William Broadhead, went on a two-month expedition, going up the Spanish River and into Mississagi Forest Reserve (today Mississagi Provincial Park). Thomson's transition from commercial art towards his own original style of painting became apparent around this time. Much of his artwork from this trip, mainly oil sketches and photographs, was lost during two canoe spills; the first was on Green Lake in a rain squall and the second in a series of rapids.In fall 1912, Albert Robson, Grip's art director, moved to the design firm Rous & Mann. A month after returning to Toronto, Thomson followed Robson and left Grip to join Rous & Mann too. They were soon joined by Varley, Carmichael and Lismer. Robson later spoke favourably of Thomson's loyalty, calling him "a most diligent, reliable and capable craftsman". Robson's success in attracting great talent was well understood. Employee Leonard Rossell believed that the key to Robson's success "was that the artists felt that he was interested in them personally and did all he could to further their progress. Those who worked there were all allowed time off to pursue their studies ... Tom Thomson, so far as I know, never took definite lessons from anyone, yet he progressed quicker than any of us. But what he did was probably of more advantage to him. He took several months off in the summer and spent them in Algonquin Park.".
What is the first name of the person Thompson followed after returning to Toronto?