[2] His childhood, and part of his adulthood, were also filled with summer camp, an institution which he attended as a camper from age four to thirteen and as a counselor from fourteen to twenty-six.

[1][5][3] Rosen has also "taught in the Ohio Art Council Poetry-in-the-Schools Program and Greater Columbus Arts Council Artist-in-the-Schools Program, and has conducted over 500 young authors' conferences, in-service days, writing workshops, guest author days, and residencies (for elementary, middle school, and high school students and teachers).

: Quirky Quizzes About What Makes You Tick, Mirth of a Nation: The Best Contemporary Humor, 101 Damnations: The Humorists' Tour of Personal Hells, The Cuckoo's Haiku, and Elijah's Angel: A Story for Chanukah and Christmas.

Now of course I mean "genuinely" funny, but I also mean also "seriously" as in "profound" — humorists are among the few dependable sources of honest (re)calibration and reality checking.”[12] The volume was later published in 2002 as an audiobook, and in 2007 in hardcover format.

[17][18] Publishers Weekly’s review said of the book that “text and images, like a well-rehearsed duet, balance and echo each other’s beauty.”[19] Rosen was interviewed several times due to the success of The Cuckoo’s Haiku.

When asked by Bill Eichenberger of The Columbus Dispatch about the similarities between birds and haiku, Rosen wrote that “Both are fleeting impressions.

Rather than whole stories and studied observations, these two arts usually offer snatched glimpses and surprising hints... For me, looking at one specific thing, one species, helps to focus and clarify ideas or principles that apply more broadly.”[20] In another interview, on the website The Miss Rumphius Effect, Rosen explained that he would “always cherish one of W. H. Auden’s definitions of poetry: clear thinking about mixed feelings,” and also, in an interview by Julie Danielson on Seven Impossible Things before Breakfast, that “Writing about wildlife is really writing about my own life”.

is a humorous factbook about the history of "a host of spheroids (and one notable ellipse) that make the sporting world go round" (Bulletin of the Center for Children’s Books, qtd.

[25] Ari L. Goldman of The New York Times called the book "so finely done that the drawings and the story line compete for attention.

"[26] In 2013, Rosen was commissioned by the Jewish Community Center of Greater Columbus to create a full-length play based on this work.

[4] He stays busy running around the country to literary conferences and classrooms trying to spread his love for literature, writing, and illustrating.

[3] Rosen has served on the board of directors for Share Our Strength for over fourteen years; the profits from six of the books he has created benefit the organization, including two cookbooks with recipes from over one hundred and fifty of the United States’ most esteemed chefs.

"[6] Rosen has been quoted in an interview saying "It has been an enormous honor to precipitate such collections and a concomitant reward to know that these generated funds offer such lasting benefits.